This no-bake Napoleon cake is one of those desserts that looks like it took all day but really relies on a few smart steps and chilling time. Layers of crunchy palmiers meet a smooth, vanilla custard that sets into a spoonable, sliceable filling. It’s forgiving, impressive, and perfect for days when you don’t want to fire up the oven.

I make this cake when I need a celebration dessert on short notice or want something I can assemble the night before. The textures—crispy cookie layers softened by rich custard—are the point. The recipe below follows the custard directions and assembly steps exactly so you get reliable results every time.

Read the shopping notes, follow the step-by-step method, and check the storage and troubleshooting sections. Little tips in the gear and “Don’t Do This” sections will save you time and keep the layers neat. Let’s get started.

Ingredients

800-900 grams Palmier or “elephant ear” cookies — these form the crisp cookie layers; the recipe notes buying the 2 lb box from Costco.
3/4 cup granulated sugar — sweetens the custard and helps with structure when cooked.
2 whole eggs + 3 yolks — provide richness and help thicken the custard.
1/3 cup corn starch — the main thickener; whisk in smoothly to avoid lumps.
1/2 cup sweetened condensed milk — adds body, sweetness, and a glossy finish to the custard.
3 cups milk — use 2% or whole milk as specified; this is the primary liquid in the custard.
1 Tbsp vanilla extract — flavor anchor for the custard (add off the heat).
1 stick (1/2 cup) unsalted butter, softened — whisked in off the heat for a silky texture.
Berries to Decorate the top — fresh berries brighten the finish and add color.
9″ springform pan, or a 9×13 glass casserole dish — the recipe provides options depending on the shape you prefer.
Cake platter — needed if you use the springform so you can release and present the cake.

Your Shopping Guide

Buy the palmiers in a large box if you can—those Costco boxes are perfect because you’ll have enough to build four cookie layers and still get crumbs for topping. Palmiers are thin and crisp; if they’re too small, trim and layer as needed. If your store sells different-sized palmiers, pick the larger pieces so you can cover the base with fewer breaks.

For the dairy, whole milk gives the richest custard, but 2% works too if you want to cut a little fat. Use fresh eggs and get unsalted butter so you can control seasoning. The sweetened condensed milk contributes sweetness and body—don’t skip it or substitute an equal volume of granulated sugar, which would change texture and cook time.

A few small purchases make assembly easier: a good whisk, a flexible spatula, plastic wrap, and a springform pan (if you want a round cake). If you don’t have a springform, a 9×13 glass dish works fine—presentation will be more rustic, but the taste remains the same.

Make No-Bake Napoleon Cake: A Simple Method

Make the custard: In a medium saucepan, combine 3/4 cup granulated sugar, 2 whole eggs and 3 egg yolks. Whisk vigorously about 1 minute until blended.
Whisk in 1/3 cup corn starch until the mixture is smooth and free of lumps.
Whisk in 1/2 cup sweetened condensed milk until incorporated.
While whisking, slowly pour in 3 cups milk (2% or whole) and whisk until smooth.
Place the saucepan over medium heat. Whisk frequently and continuously until the mixture thickens and just begins to boil (about 8–10 minutes). Remove from heat immediately.
Off the heat, whisk in 1 tablespoon vanilla extract. Add 1 stick (1/2 cup) unsalted butter, softened, and whisk until fully incorporated and smooth.
Cover the custard surface directly with plastic wrap (press the wrap onto the surface so a skin does not form). Let sit at room temperature for 1 hour, until the custard is just barely warm.
While the custard cools, prepare the cookies: If needed to fit your pan, cut large palmiers in half. To do this, stack a few cookies and carefully saw through them with a serrated knife.
Reserve 3–4 cookies in a large zip-top bag and crush them with a rolling pin to make crumbs for coating the finished cake. (You can crush more later if you want extra crumbs for the top/sides.)
Prepare your pan: For a 9″ springform, remove the base and place the tightened ring in the center of a cake platter. For a 9×13 glass casserole dish, leave it as is on the counter.
Assemble the cake: Spread about 4 heaping tablespoons of custard into the center of the pan (or inside the springform ring) and hold the ring steady. Arrange whole or halved palmiers in a single layer across the bottom so the base is covered. Break or trim cookies as needed to fit snugly.
Dollop about 5 heaping tablespoons of custard over that cookie layer and spread evenly with a spatula to cover the cookies.
Repeat alternating layers of cookies and custard until you have four layers of cookies total. Each cookie layer should be covered with custard.
Spread any remaining custard over the top, smoothing to seal gaps and cover the top layer of cookies completely.
Cover the assembled cake with plastic wrap and refrigerate overnight (or at least several hours) to set.
To finish, remove the cake from the refrigerator. If using a springform, run a thin spatula around the inside edge to loosen, then release and remove the ring. If using a casserole dish, run a spatula around the edge if needed to loosen.
Sprinkle the reserved crushed cookies over the top and gently press crumbs onto the sides to adhere.
Arrange berries on top to decorate. Slice and serve.

Reasons to Love No-Bake Napoleon Cake

It looks elegant without a complicated recipe—perfect for guests or a low-effort celebration.
No oven time: the custard cooks on the stovetop and the rest is assembly and chill time.
Texture contrast: crunchy palmiers give way to creamy, silky custard in each bite.
Flexible assembly: the cake can be made in a springform or a casserole dish depending on what you have.
Make-ahead friendly: chilling overnight improves flavor and makes slicing cleaner.

Substitutions by Category

Cookies: If you can’t find palmiers, use other thin, crispy cookies that will soften against the custard—think similar-texture cookies rather than soft sandwich cookies.
Milk: Whole milk yields the creamiest custard; 2% will work if you want a lighter mouthfeel.
Sweetener/body: The sweetened condensed milk contributes both sweetness and body. If you omit it you’ll need to adjust sugar and possibly the cooking approach—so stick with it for best texture.
Flavoring: Vanilla is classic. You can add a small amount of lemon zest or a splash of almond extract (use sparingly) if you want a different aromatic note.
Toppings: Fresh berries are the suggested finish; thinly sliced stone fruit or apricot preserves brushed on top also work seasonally.

What’s in the Gear List

Medium saucepan — for cooking the custard evenly.
Whisk — you’ll use this continuously while cooking to prevent lumps and scorching.
Flexible spatula — for spreading custard and smoothing layers.
Serrated knife — to trim large palmiers without shattering them.
Rolling pin and zip-top bag — for crushing reserved cookies into crumbs.
9″ springform pan or 9×13 glass casserole dish — assembly vessel chosen in the ingredients.
Plastic wrap — press directly onto custard while it cools, and cover the assembled cake for chilling.
Cake platter — used if assembling in a springform so you can release and present the cake easily.

Don’t Do This

Do not skip pressing plastic wrap onto the custard surface while it cools—otherwise you’ll get a skin that makes spreading uneven layers harder.
Don’t stop whisking once the custard starts thickening. Heat it too long and you’ll scorch or curdle it; pull it at the first gentle boil.
Avoid piling too many cookie layers without enough custard between them; each cookie layer needs a generous coat to soften properly and bind the cake.
Don’t try to speed up setting in a freezer—rapid chilling can change texture. Refrigerate overnight for best results.

Fresh Takes Through the Year

Spring: Top with a mix of strawberries and rhubarb compote for brightness. Use lemon zest in the custard for lift.
Summer: Pile on mixed berries and serve chilled—no extra garnish needed since the fruit is the star.
Autumn: Stir a pinch of cinnamon into the custard and garnish with poached pears or figs.
Winter: Add a splash of orange liqueur to the custard (off-heat) and decorate with candied orange peel and pomegranate seeds.

Cook’s Commentary

I love how forgiving this recipe is. The custard recipe is stable: the cornstarch and eggs create a thick, spoonable base that holds layers without collapsing. That said, texture depends on the palmiers—if they’re extremely thin they’ll become soft quickly; thicker ones keep a little bite after chilling. I generally assemble the cake the night before so the cookies absorb just enough moisture to be tender without turning to mush.

For neat slices, sharpen your knife and wipe it clean between cuts. If serving at a party, slice and plate in advance if you can—this cake stands up nicely and looks polished on a platter.

Best Ways to Store

Refrigerator: Store the cake covered in plastic wrap or an airtight container for up to 3 days. The custard keeps its flavor and texture best on day one and two; by day three textures can soften further but it will still taste good.
Freezer: Freezing is not recommended. The custard’s texture changes when frozen and thawed, becoming grainy.
Leftover slices: Keep individual slices in an airtight container in the fridge for up to 48 hours; bring to room temperature for 15–20 minutes before serving for best flavor.

Frequently Asked Questions

Can I use a different cookie? Use a thin, crisp cookie similar to palmiers for best layering behavior. Soft sandwich cookies will get too soggy.
How long does the custard take to thicken? About 8–10 minutes over medium heat, whisking constantly until it just begins to boil.
Can I make the custard ahead of time? Yes. Cook it, press plastic wrap to the surface, and refrigerate. Bring it to just barely warm before assembling so it spreads easily.
What if my custard has lumps? Strain it through a fine mesh sieve before covering to remove any lumps, then press plastic wrap to the surface.

The Takeaway

No-bake Napoleon cake is an elegant, approachable dessert that relies on a well-made custard and simple assembly. Follow the custard steps, be gentle with the palmiers, and give it plenty of chill time. You’ll end up with clean slices, lovely texture contrasts, and a dessert that’s far easier than it looks. Make it for a gathering, keep it chilled for the next day, and don’t be surprised if it becomes a requested repeat.

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No-Bake Napoleon Cake Recipe

A layered no-bake Napoleon cake made with palmiers (elephant ear cookies) and a vanilla custard filling. Assemble in a springform or casserole dish, chill overnight, then finish with crushed cookie crumbs and berries.

Prep Time1 20

Cook Time10

Total Time1 30

Course: Dessert

Servings: 9 servings

Ingredients

800-900 gramsPalmier or "elephant ear" cookies we buy the 2 lb box from Costco
3/4 cupgranulated sugar
2 whole eggs + 3 yolks from large eggs
1/3 cupcorn starch
1/2 cupsweetened condensed milk
3 cupsmilk 2% or whole milk
1 Tbspvanilla extract
1 stick 1/2 cup unsalted butter, softened
Berries to Decorate the top
9 " springform pan or a 9 x13 glass casserole dish
Cake platter

Instructions

Make the custard: In a medium saucepan, combine 3/4 cup granulated sugar, 2 whole eggs and 3 egg yolks. Whisk vigorously about 1 minute until blended.
Whisk in 1/3 cup corn starch until the mixture is smooth and free of lumps.
Whisk in 1/2 cup sweetened condensed milk until incorporated.
While whisking, slowly pour in 3 cups milk (2% or whole) and whisk until smooth.
Place the saucepan over medium heat. Whisk frequently and continuously until the mixture thickens and just begins to boil (about 8–10 minutes). Remove from heat immediately.
Off the heat, whisk in 1 tablespoon vanilla extract. Add 1 stick (1/2 cup) unsalted butter, softened, and whisk until fully incorporated and smooth.
Cover the custard surface directly with plastic wrap (press the wrap onto the surface so a skin does not form). Let sit at room temperature for 1 hour, until the custard is just barely warm.
While the custard cools, prepare the cookies: If needed to fit your pan, cut large palmiers in half. To do this, stack a few cookies and carefully saw through them with a serrated knife.
Reserve 3–4 cookies in a large zip-top bag and crush them with a rolling pin to make crumbs for coating the finished cake. (You can crush more later if you want extra crumbs for the top/sides.)
Prepare your pan: For a 9" springform, remove the base and place the tightened ring in the center of a cake platter. For a 9x13 glass casserole dish, leave it as is on the counter.
Assemble the cake: Spread about 4 heaping tablespoons of custard into the center of the pan (or inside the springform ring) and hold the ring steady. Arrange whole or halved palmiers in a single layer across the bottom so the base is covered. Break or trim cookies as needed to fit snugly.
Dollop about 5 heaping tablespoons of custard over that cookie layer and spread evenly with a spatula to cover the cookies.
Repeat alternating layers of cookies and custard until you have four layers of cookies total. Each cookie layer should be covered with custard.
Spread any remaining custard over the top, smoothing to seal gaps and cover the top layer of cookies completely.
Cover the assembled cake with plastic wrap and refrigerate overnight (or at least several hours) to set.
To finish, remove the cake from the refrigerator. If using a springform, run a thin spatula around the inside edge to loosen, then release and remove the ring. If using a casserole dish, run a spatula around the edge if needed to loosen.
Sprinkle the reserved crushed cookies over the top and gently press crumbs onto the sides to adhere.
Arrange berries on top to decorate. Slice and serve.

Equipment

9-inch springform pan (or 9x13-inch glass casserole dish)
cake platter
Medium Saucepan
Whisk
Spatula
Plastic Wrap
Serrated Knife
Rolling Pin
Zip-top Bag

Notes

Notes
*Tips for success: Stir custard often on the stove, and whisk constantly towards the end so it doesn't get lumpy. As soon as you feel it starting to thicken, watch it closely since the boil can be hidden by the milk foam at the top.
**Add broken pieces of cookie to fill any large gaps.