This cake is exactly what it sounds like: a tender yellow sheet cake soaked with a dulce de leche–infused tres leches mixture, topped with Cool Whip and a caramel drizzle. It’s built for busy cooks who want an impressive dessert with minimal fuss. The canned dulce de leche does the heavy lifting here—rich, caramelized sweetness that blends evenly into the milky soak.

The method is straightforward: bake a boxed yellow cake, poke holes so the milk mixture can sink in, pour, chill, then finish with whipped topping and a drizzle. The result is silky and indulgent without requiring pastry-level skills. It keeps cleanly in the pan, which makes it great for potlucks, holidays, or an easy weekend showstopper.

I’ll walk you through the ingredients, the exact step-by-step directions, and practical tips I learned while testing this. Expect clear notes on timing, temperature, and small adjustments that save texture and flavor. No fluff—just the dependable approach that works every time.

What You’ll Need

Ingredients

1 pkg. 2-layer size yellow cake mix — the cake base; follow the mix instructions for batter preparation and baking.
1 can 13.4 oz. Mexican caramel spread (dulce de leche), divided — provides the caramel flavor for the soak and a reserved drizzle; the can is split for both uses.
2 tsp. water — used to loosen the reserved dulce de leche for drizzling.
1 can 12 oz. evaporated milk — the concentrated milk in the tres leches mixture that adds body and richness.
1/2 cup BREAKSTONE’S or KNUDSEN Sour Cream — adds a mild tang and helps the soak stay silky rather than thin.
1-1/2 cups thawed COOL WHIP Whipped Topping — the top layer; use thawed COOL WHIP for stable, even coverage.

Build Dulce de Leche Tres Leches Cake Step by Step

Preheat oven to 350°F. Prepare cake batter and bake as directed on the cake mix package for a 13×9-inch pan.
Cool the cake in the pan for 10 minutes. After 10 minutes, use a large fork to pierce the cake surface at 1/2-inch intervals across the entire top.
From the can of dulce de leche, measure and set aside 2 tablespoons for the drizzle. Place those 2 tablespoons in a small microwave-safe bowl and add 2 teaspoons water; stir until blended and set aside.
In a blender, combine the remaining dulce de leche from the can, the 12 oz can evaporated milk, and 1/2 cup sour cream. Blend until smooth.
Pour the blended milk/dulce de leche mixture evenly over the pierced cake in the pan. If needed, re-pierce the surface so the liquid is absorbed.
Refrigerate the cake in the pan for 1 hour to allow the milk mixture to soak in and the cake to chill.
Microwave the reserved dulce de leche and water mixture on HIGH for 10 seconds, then stir and let cool slightly.
Spread 1 1/2 cups thawed COOL WHIP evenly over the chilled cake.
Use a spoon to drizzle the warmed reserved dulce de leche over the frosted cake. Keep the cake refrigerated until serving.

Why I Love This Recipe

This version is a reliable shortcut that still tastes like something homemade and special. The boxed yellow cake saves time and produces a tender crumb that soaks up the milk mixture well. Using canned dulce de leche gives an instantly recognizable caramel profile that would otherwise take hours to achieve from scratch.

Texture-wise, it strikes a pleasing balance: the cake is moist but not soggy, because the sour cream in the milk blend adds body and controls the soak. The Cool Whip keeps the finish light and easy to slice, and the warmed reserved dulce de leche adds a pretty, glossy finish that reads elegant on the plate.

It’s also forgiving. If you underbake slightly, the soak helps; if you overbake a touch, the milk mixture restores tenderness. That makes it a great choice for hosts who want a dessert with high reward and low drama.

Budget & Availability Swaps

Cake mix — use a store-brand yellow cake mix if you want to save a few dollars; it performs the same in this recipe.
Dulce de leche — if Mexican caramel spread is hard to find, look for dulce de leche in the baking aisle or alongside Latin groceries; you can also simmer a can of sweetened condensed milk to make your own if you have time.
Cool Whip — for budget reasons, store-brand frozen whipped topping works; thaw it fully before spreading.

Cook’s Kit

13×9-inch baking pan — the recipe is sized for this pan; the soak and bake times assume it.
Large fork or skewer — for piercing the cake at 1/2-inch intervals to aid absorption.
Blender — to fully emulsify the dulce de leche with evaporated milk and sour cream so the soak pours evenly.
Small microwave-safe bowl and spoon — to loosen the reserved dulce de leche for the drizzle.
Offset spatula or rubber spatula — to spread the COOL WHIP smoothly across the chilled cake.

Steer Clear of These

Don’t skip piercing the cake. If you omit the holes, the milk mixture will mostly run off the surface instead of soaking in, and you’ll lose the classic tres leches texture. Also, avoid pouring the milk mixture too hot—if your dulce de leche was heated in the can or warmed, let it cool slightly before blending; you want the soak to be cool enough that the cake doesn’t cook further in the pan.

Don’t try to frost the cake with COOL WHIP while the cake is still warm. The topping will melt and become watery. Chill the cake at least the hour specified, then spread the thawed COOL WHIP so it holds structure and slices cleanly.

Health-Conscious Tweaks

If you’re watching calories or saturated fat, there are modest ways to lighten this without losing the core idea. Use a reduced-fat sour cream or a light cultured sour cream in place of full-fat; it will slightly change the mouthfeel but still adds tang and body. Swap Cool Whip for a lighter frozen whipped topping labeled “light” if available. For a less-sweet option, use a plain yellow cake mix and reduce any additional sugar in a homemade batter—though in this specific recipe the cake mix sweetness is balanced by the milky soak.

For those avoiding processed toppings, beat chilled heavy cream with a touch of vanilla and a small amount of powdered sugar until it holds soft peaks, then use it in place of Cool Whip. Keep in mind whipped cream will be softer and less stable than Cool Whip, so slice soon after topping.

What I Learned Testing

Small changes in technique made the biggest difference. First, the piercing pattern matters: aim for even 1/2-inch intervals so every forkful gets soaked. I tested wider holes and they created uneven pockets of sogginess. Second, blending the evaporated milk, sour cream, and dulce de leche created a uniform liquid that poured evenly and didn’t leave streaks—skip the blender and you risk uneven caramel clumps.

Chilling time is more important than you might think. The one-hour refrigeration both allows the milk to settle into the crumb and firms the cake enough to accept the Cool Whip without it sinking. I also found that warming the reserved dulce de leche for only a few seconds makes it fluid enough to drizzle but keeps it thick enough to hold pretty lines on top.

Finally, if you plan to serve the cake at an event, make it a few hours ahead and keep it refrigerated. The texture continues to set and slices look cleaner after a short rest in the fridge.

How to Store & Reheat

Keep the cake refrigerated in the original pan, covered with plastic wrap or a cake lid, for up to 3–4 days. The Cool Whip holds fairly well, but the cake will continue to absorb moisture and become softer over time, so the first 48 hours are when it’s at its best.

Do not freeze the finished, frosted cake—Cool Whip doesn’t freeze and thaw well. If you need to freeze, bake the cake and freeze the unfrosted, fully cooled cake wrapped tightly; thaw in the refrigerator before soaking and finishing, though texture may be slightly different.

Reheat? This cake is best served chilled. If you want a warm slice, gently warm a single serving in the microwave for 8–10 seconds to take the chill off, but be aware the Cool Whip will soften quickly—remove or replace the topping for a warm presentation.

Frequently Asked Questions

Can I make this with a different cake mix? Yes. Yellow cake gives the classic flavor, but white cake mix also works. Anything denser (like pound cake mix) will change the soak profile.
What if my dulce de leche is very thick? The recipe accounts for this: reserve 2 tablespoons and loosen with 2 teaspoons water for the drizzle, and blend the rest with evaporated milk and sour cream to ensure it pours.
Can I use homemade dulce de leche? Absolutely. Homemade or stove-top caramelized condensed milk will work; just measure and divide as directed.
How do I get clean slices? Use a thin, sharp knife and wipe it between cuts with a warm towel. Chill the cake well before slicing.

The Last Word

Simple choices—boxed cake, canned dulce de leche, and Cool Whip—come together to create a dessert that looks like effort and tastes rich and comforting. The technique matters more than fancy ingredients: pierce evenly, blend the soak, chill properly, and your Dulce de Leche Tres Leches Cake will deliver consistent results every time. Make it for gatherings, bring it to potlucks, or keep it in the fridge for an elegant everyday treat.

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Dulce de Leche Tres Leches Cake

A tres leches-style cake made by soaking a baked yellow cake with a dulce de leche and evaporated milk mixture, then topping with thawed Cool Whip and a dulce de leche drizzle.

Prep Time25

Cook Time41

Total Time2 3

Course: Dessert

Cuisine: Mexican

Servings: 16 servings

Ingredients

1 pkg.2-layer size yellow cake mix
1 can13.4 oz. Mexican caramel spread dulce de leche, divided
2 tsp.water
1 can12 oz. evaporated milk
1/2 cupBREAKSTONE'S or KNUDSEN Sour Cream
1-1/2 cupsthawed COOL WHIP Whipped Topping

Instructions

Preheat oven to 350°F. Prepare cake batter and bake as directed on the cake mix package for a 13x9-inch pan.
Cool the cake in the pan for 10 minutes. After 10 minutes, use a large fork to pierce the cake surface at 1/2-inch intervals across the entire top.
From the can of dulce de leche, measure and set aside 2 tablespoons for the drizzle. Place those 2 tablespoons in a small microwave-safe bowl and add 2 teaspoons water; stir until blended and set aside.
In a blender, combine the remaining dulce de leche from the can, the 12 oz can evaporated milk, and 1/2 cup sour cream. Blend until smooth.
Pour the blended milk/dulce de leche mixture evenly over the pierced cake in the pan. If needed, re-pierce the surface so the liquid is absorbed.
Refrigerate the cake in the pan for 1 hour to allow the milk mixture to soak in and the cake to chill.
Microwave the reserved dulce de leche and water mixture on HIGH for 10 seconds, then stir and let cool slightly.
Spread 1 1/2 cups thawed COOL WHIP evenly over the chilled cake.
Use a spoon to drizzle the warmed reserved dulce de leche over the frosted cake. Keep the cake refrigerated until serving.