Gooey Chocolate Peanut Butter Dump Cake

This chocolate peanut butter dump cake is one of those desserts that feels like a warm brownie and a Reese’s cup collided in the best way. It comes together with almost zero effort, no mixing bowls required.

You literally dump layers into a pan and let the oven do the work. 35 minutes later you pull out a pan of molten chocolate with swirls of salty peanut butter and just the right amount of chew around the edges.

Why This Dump Cake Works

The sweetened condensed milk turns the dry cake mix into a fudgy, tender crumb instead of a dusty layer. Every forkful gets a ribbon of melted peanut butter and pockets of chocolate chips.

It stays gooey in the center even after it cools, so you get that warm brownie texture without any fussy mixing. I reach for this recipe when I need a dessert that looks like I tried way harder than I actually did.

Ingredients

• 1 box (15.25 oz) chocolate cake mix: any standard boxed devil’s food or dark chocolate mix works fine
• 1/2 cup unsalted butter, melted: salted butter is okay here because the peanut butter carries plenty of salt
• 1 can (14 oz) sweetened condensed milk: full-fat gives the richest texture
• 1/2 cup creamy peanut butter: use the smooth, no-stir kind so it spreads in the oven
• 1/2 cup semisweet chocolate chips: milk chocolate chips work too if you like a sweeter bite

Variations / Substitutions

• Crunchy peanut butter: adds a little nub of salt and crunch in every other bite; just stir it well before dolloping
• Peanut butter chips: swap half the chocolate chips for peanut butter chips for even more peanut punch
• Chopped peanuts: scatter a handful over the top before baking for a crunchy crust
• Brownie mix: a box of brownie mix works the same way and makes the center even fudgier
• Dairy-free: use a dairy-free cake mix, plant-based butter, coconut condensed milk, and dairy-free chocolate chips

Strawberry Dump Cake is another reader favorite dessert worth making next.

How to Make Gooey Chocolate Peanut Butter Dump Cake

Step 1: Layer the Cake Mix

Preheat your oven to 350°F (180°C). Pour the entire box of dry chocolate cake mix into an ungreased 9×13-inch baking dish. Use your hand or a spatula to spread the powder into an even layer. No need to grease the pan, the butter and condensed milk will coat the bottom as it bakes.

Step 2: Drizzle the Butter and Milk

Slowly drizzle the 1/2 cup melted butter over the dry mix, trying to cover as much of the surface as you can. Go right back over it with the entire can of sweetened condensed milk, pouring in a thin stream so it soaks into any dry patches. After 5 minutes in the oven, the liquids will start bubbling through the powder, and you will know you are on the right track.

Step 3: Dollop the Peanut Butter and Chips

Drop small spoonfuls of the 1/2 cup peanut butter all over the surface; no need to spread them, the heat will melt the peanut butter into ribbons. Scatter the 1/2 cup chocolate chips evenly across the top. The pan will look messy, and that is exactly what you want.

Step 4: Bake the Cake

Slide the dish into the 350°F oven and bake for 35 minutes. Start checking at the 30-minute mark: the edges should be dark golden and pulling away from the sides, and the center should still jiggle slightly when you nudge the pan. A toothpick inserted an inch from the side should come out with a few moist crumbs, not raw batter.

Step 5: Slice and Serve Warm

Let the cake rest on the counter for 10 minutes so the hot sugar settles. Cut into large squares and use a spatula to lift them out. Serve warm with a scoop of vanilla ice cream, and the chocolate swirls will stretch a little when you pull the spoon away.

Tips for the Best Dump Cake

• Let the butter cool for 2 minutes after melting so it does not hit the cake mix boiling hot and create gummy spots.
• Do not stir the layers once they are in the pan. Stirring turns a dump cake into a heavy batter, and you will lose the distinct ribbons of peanut butter and fudgy pockets.
• If the corners are getting too dark before the center sets, tent the dish loosely with foil after 30 minutes and keep baking.
• A thin, flexible metal spatula works best for lifting the first square out of the pan without tearing the gooey middle.

Bake times by pan size:

Storing Leftovers

Refrigerate: Cover the dish tightly and store in the fridge for up to 4 days. Eat the leftovers cold for a straight-from-the-pan brownie texture, or warm them in the microwave.

Reheating: A 20-second zap in the microwave returns the gooey center, and a quick toast under the broiler crisps the top back up in 2 minutes.

Frequently Asked Questions

Can I use natural peanut butter with the oil on top?

Yes, but stir the jar really well first so the oils are fully blended. Natural peanut butter tends to be thinner, so the ribbons may sink a little more, but the flavor will still be there.

What if I want to use a glass baking dish instead of metal?

Lower the oven temperature to 325°F (165°C) and add about 5 minutes to the bake time. Glass holds heat longer, so the center will continue setting after you pull it out.

Can I make half of this recipe?

Absolutely. Use an 8×8-inch pan and halve all the ingredient amounts. The bake time drops to roughly 30 to 35 minutes in that smaller pan.

Does the cake freeze well after baking?

It does. Cool it completely, cut into squares, and wrap each piece tightly in plastic wrap before freezing for up to 2 months. Thaw in the fridge overnight, then reheat before serving.

Chocolate Peanut Butter Dump Cake Recipe

Print Recipe Pin Recipe

Prep Time 5 minutes mins

Cook Time 35 minutes mins

Total Time 40 minutes mins

Servings: 12 servings

Calories: 410

Ingredients Method Notes

Ingredients

  

• 1 box (15.25 oz) chocolate cake mix
• 1/2 cup unsalted butter, melted
• 1 can (14 oz) sweetened condensed milk
• 1/2 cup creamy peanut butter
• 1/2 cup semisweet chocolate chips

Method

 

1. Preheat oven to 350°F (180°C). Spread the dry chocolate cake mix evenly in an ungreased 9×13-inch baking dish.
2. Drizzle the melted butter over the cake mix, followed by the sweetened condensed milk, covering as much of the powder as possible.
3. Drop small spoonfuls of peanut butter over the top and scatter the chocolate chips evenly.
4. Bake for 35 minutes until the edges are golden and the center is set with a slight jiggle.
5. Let the cake rest 10 minutes, then slice into squares and serve warm.

Notes

The cake will look loose in the center when you pull it from the oven. A 10-minute rest on the counter firms it up just enough to slice cleanly while keeping the middle soft and fudgy. If you prefer a firmer texture, bake an extra 5 minutes.