These little cake bites are a weekday-friendly patch of chocolate comfort. They bake in a greased mini muffin pan and finish with a glossy, fudgy frosting studded with walnuts. They’re not fussy, they travel well, and they cut the faff of cutting a whole sheet cake into neat squares.

I make these when I want to bring something to a coffee morning, when the pantry needs a use-up mission, or when I want a portion-controlled chocolate fix. The batter comes together in one bowl with a quick hot-butter-and-cocoa step that wakes up the cocoa flavor, and the frosting is a simple stovetop, spoon-on style that sets to a slightly shiny, tender finish.

This post walks through everything I learned testing them: what to measure carefully, how to tweak the texture, where the flavor comes from, and how to store leftovers so they stay tender. No fluff — just practical tips so your first batch behaves exactly the way you’d hope.

What We’re Using

2 cups sugar — sweetens the cakes and helps keep them moist; measure with a dry cup and level off.
2 cups all purpose flour — provides structure; spoon into the cup then level for accuracy.
1/2 tsp salt — balances sweetness and enhances chocolate flavor.
1 cup butter — melted into the batter base for richness and tenderness.
3/4 cup water — dissolves cocoa and melts butter in the stovetop step; hot liquid helps bloom the cocoa.
5 tbsp cocoa powder (Dutch-process recommended) — deep chocolate flavor; Dutch-process is less acidic and darker.
1/2 cup buttermilk — adds tang and tenderness to the cake crumb.
2 eggs — binders that give lift and stability.
1 tsp baking soda — the leavening that reacts with buttermilk to help the batter rise.
6 tbsp buttermilk (milk works fine too) — for the frosting base; buttermilk gives slight tang and a softer set.
1/2 cup butter — added to the frosting for richness and sheen.
5 tbsp cocoa powder — for the frosting; matches the cake’s chocolate profile.
1 lb powdered sugar — sweetens and thickens the frosting to a spoonable consistency.
1 tsp vanilla extract — lifts the chocolate and rounds the sweetness.
1 cup walnuts, chopped — folded into the frosting for crunch and a toasty contrast.

Sheet Cake Bites Cooking Guide

Preheat the oven to 350°F. Heavily grease a mini muffin tin (or use nonstick spray).
In a large bowl, combine 2 cups sugar, 2 cups all purpose flour, 1/2 tsp salt, and 1 tsp baking soda. Set aside.
In a saucepan, combine 1 cup butter, 3/4 cup water, and 5 tbsp cocoa powder (Dutch-process recommended). Bring to a boil over medium heat, stirring until the butter melts and the cocoa is dissolved. Remove from heat.
Pour the hot butter–cocoa mixture over the dry ingredients. Use a hand mixer to mix until combined.
Add 1/2 cup buttermilk and 2 eggs to the batter. Mix with the hand mixer until smooth; the batter will be thin.
Place 1 tablespoon of batter into each cup of the greased mini muffin tin. Bake at 350°F for 10–12 minutes, or until a toothpick inserted into the center comes out clean.
Let the cake bites cool in the pan for about 5 minutes, then gently remove them to a wire rack to cool completely.
For the frosting, in a medium saucepan heat 6 tbsp buttermilk (or milk), 1/2 cup butter, and 5 tbsp cocoa powder over medium heat, stirring, until the mixture is bubbly. Remove from heat.
Whisk in 1 lb powdered sugar and 1 tsp vanilla extract until the frosting is smooth and well combined. Stir in 1 cup chopped walnuts.
When the cake bites are completely cool, spoon about 1 tablespoon of frosting over each one. Let the frosting set before serving.

Reasons to Love Sheet Cake Bites

These little cakes check a surprising number of boxes: quick to make, portion-controlled, easy to transport, and reliably chocolatey. They’re a good bridge between cupcakes and a full sheet cake — you get the soft cake crumb with the convenience of single serves.

Speed: Batter comes together fast and they bake in 10–12 minutes.
Portion control: Single-serving helps with sharing and calorie awareness.
Flavor payoff: Hot butter and cocoa stage intensifies the chocolate taste with minimal effort.
Make-ahead friendly: You can frost once cool and keep them ready for a gathering.

Flavor-Forward Alternatives

If you want to riff on the base, choose one focused change at a time so you can tell what worked.

Add a teaspoon of espresso powder to the cocoa step to amplify chocolate without making it taste like coffee.
Switch walnuts for chopped pecans or toasted hazelnuts for a different nutty profile—toast them quickly in a dry pan first.
Stir 1/4 cup mini chocolate chips into the batter for pockets of melted chocolate.
Swap the vanilla in the frosting for almond extract (1/2 tsp) for a marzipan-like twist—start small with strong extracts.
For a boozy finish, stir 1–2 tbsp of dark rum or bourbon into the frosting after it cools slightly.

Setup & Equipment

Being organized before you start keeps the little cakes moving through the oven and frosting stage smoothly. Lay everything out and preheat early.

Mini muffin tin (standard mini cups) — this recipe is scaled for those small wells; greasing well prevents sticking.
Hand mixer — recommended for quick, even mixing; you can use a whisk, but it will take more elbow grease.
Two saucepans — one for the batter’s hot butter–cocoa mixture and one for the frosting (medium sized).
Measuring cups and spoons — accuracy matters for baking; especially for cocoa, baking soda, and buttermilk.
Wire rack — cool the cake bites completely before frosting to prevent a runny topping.
Small cookie scoop or tablespoon — helps portion the batter evenly for uniform baking.

Things That Go Wrong

These are the problems you’re most likely to encounter and how to fix them fast.

Gooey centers: If cake bites seem underdone after 12 minutes, test with a toothpick. Remember, thin batter in mini pans cooks quickly. If still gooey, bake 1–2 minutes more and check again.
Sticking to the pan: If your pan is not well greased, the cakes can cling. Use a good nonstick spray or rub melted butter into each cup and dust lightly with flour.
Frosting too thin: If your frosting runs off the cake because the cake was still warm, let the cake bites cool to room temperature. If the frosting is loose after mixing, chill it briefly to thicken before spooning.
Gritty frosting: Powdered sugar should be fully whisked in; if you still get grit, continue whisking or strain very quickly through a fine sieve to remove lumps.
Overbaked dryness: Mini cakes dry out quickly if left even a minute too long. Start checking at 10 minutes and pull them out as soon as a toothpick comes out clean.

Make It Diet-Friendly

You can lighten these without losing the essential texture, but expect subtle changes in flavor and mouthfeel.

Lower the fat: Replace the 1 cup butter in the batter with 3/4 cup applesauce + 1/4 cup melted butter for a leaner cake. The original recipe relies on butter for richness, so results will be slightly less tender.
Sugar alternatives: Use a cup-for-cup granulated sugar substitute labeled for baking (erythritol blends) but know the texture and browning will change.
Frosting swap: Use low-fat milk instead of buttermilk for the frosting base and reduce the powdered sugar by 1/4 lb to reduce sweetness; texture will be thinner so chill to set.
Nut-free option: Omit walnuts entirely for lower fat and calorie count, or replace with toasted sunflower seeds if you need a protein bump.

Notes from the Test Kitchen

After several runs, a few small habits made the difference between “just fine” and “I want to make these every week.”

Measure flour by spooning it into the cup and leveling — packed flour yields a dense bite and changes the thin batter balance.
The batter is meant to be thin; that’s normal. It puffs in the mini pan and sets to a moist crumb.
Timing is everything: start checking at 10 minutes. Overbaking dries the cakes fast because mini pans concentrate heat.
Cool fully before frosting. I learned this the hard way — warm cakes melt the frosting and make a mess.
Chop the walnuts fairly small so they distribute evenly in the frosting and don’t poke through the topping when you bite in.

Keep-It-Fresh Plan

Storage depends on how long you want them to last and whether they’re frosted.

Room temperature: Store unfrosted cake bites in an airtight container for up to 2 days. Frosted ones keep well at room temperature for about 24 hours if your kitchen is cool.
Refrigerator: Frosted cake bites can be stored in the fridge in a single layer in an airtight container for up to 5 days. Bring to room temperature before serving for best texture.
Freezing: Freeze unfrosted cake bites on a baking sheet until solid, then transfer to a freezer bag for up to 3 months. Thaw overnight in the fridge, then frost. You can also freeze frosted bites, but the frosting will firm up and may change texture.

Common Questions

Can I use regular cocoa for the batter? — Yes. The recipe recommends Dutch-process for flavor, but natural cocoa will work. Expect a slightly brighter, more acidic chocolate note with natural cocoa.
Can I make these in a full-size muffin tin? — The recipe is scaled for mini muffin tins. If you use a full-size, increase baking time significantly and expect a different texture. I recommend sticking to mini pans or dividing batter into a well-greased 8×8 pan and adjusting time while watching closely.
My frosting is too thick — what then? — Whisk in a teaspoon of milk or buttermilk at a time until it reaches a spoonable consistency. Warm it slightly over low heat if it has stiffened too much, but do not overheat or the powdered sugar will seize.
Are the walnuts necessary? — They add crunch and flavor but can be omitted for a nut-free version. Consider substituting toasted coconut flakes or leaving the frosting plain.
Why is my batter so thin? — Thin batter in this recipe is expected because of the hot butter–cocoa mixture and the overall wet-to-dry ratio. It yields a tender, moist mini cake once baked.

Time to Try It

These Sheet Cake Bites are a simple, satisfying project with predictable results if you follow the hot-cocoa step, measure flour carefully, and resist frosting a warm cake. Start with the base exactly as written the first time, then experiment with one change at a time — nuts, extracts, or a handful of chips.

Make the batter, fill your mini cups, and set a timer for ten minutes. The payoff is quick: bite-sized chocolate with a spoon-on frosting that sets to a tender finish. Let me know how your batch turns out and what variation becomes your new favorite.

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Sheet Cake Bites

Mini chocolate cake bites baked in a greased mini muffin tin and topped with a cocoa frosting studded with chopped walnuts.

Prep Time10

Cook Time10

Total Time20

Course: Dessert

Servings: 72 servings

Ingredients

2 cupssugar
2 cupsall purpose flour
1/2 tspsalt
1 cupbutter
3/4 cupwater
5 tbspcocoa powderdutch process cocoa works best
1/2 cupbuttermilk
2 eggs
1 tspbaking soda
6 tbspbuttermilk milk works fine too
1/2 cupbutter
5 tbspcocoa powder
1 lbpowdered sugar
1 tspvanilla extract
1 cupwalnutschopped

Instructions

Preheat the oven to 350°F. Heavily grease a mini muffin tin (or use nonstick spray).
In a large bowl, combine 2 cups sugar, 2 cups all purpose flour, 1/2 tsp salt, and 1 tsp baking soda. Set aside.
In a saucepan, combine 1 cup butter, 3/4 cup water, and 5 tbsp cocoa powder (Dutch-process recommended). Bring to a boil over medium heat, stirring until the butter melts and the cocoa is dissolved. Remove from heat.
Pour the hot butter–cocoa mixture over the dry ingredients. Use a hand mixer to mix until combined.
Add 1/2 cup buttermilk and 2 eggs to the batter. Mix with the hand mixer until smooth; the batter will be thin.
Place 1 tablespoon of batter into each cup of the greased mini muffin tin. Bake at 350°F for 10–12 minutes, or until a toothpick inserted into the center comes out clean.
Let the cake bites cool in the pan for about 5 minutes, then gently remove them to a wire rack to cool completely.
For the frosting, in a medium saucepan heat 6 tbsp buttermilk (or milk), 1/2 cup butter, and 5 tbsp cocoa powder over medium heat, stirring, until the mixture is bubbly. Remove from heat.
Whisk in 1 lb powdered sugar and 1 tsp vanilla extract until the frosting is smooth and well combined. Stir in 1 cup chopped walnuts.
When the cake bites are completely cool, spoon about 1 tablespoon of frosting over each one. Let the frosting set before serving.