Peanut Butter Cup Dump Cake with Brownie Mix

This peanut butter cup dump cake with brownie mix is built for the moments when you want a warm chocolate dessert without measuring a long list of ingredients. A fudgy brownie layer bakes over creamy peanut butter, chocolate chips, and chopped peanut butter cups until the edges are set and the center stays soft. Serve it in generous spoonfuls with vanilla ice cream while the middle is still warm.

Why You’ll Love This Peanut Butter Cup Dump Cake

• Minimal mixing: The brownie batter is stirred in one bowl and layered directly in the baking dish.
• Warm, gooey center: Peanut butter and chocolate melt together as the cake bakes.
• Perfect for sharing: One dish makes an easy dessert for family dinners, potlucks, or movie nights.
• Flexible toppings: Add peanuts, pretzels, flaky salt, or a drizzle of chocolate sauce.
• No decorating required: It looks generous and inviting straight from the oven.

Ingredients

This makes 12 servings in a 9-by-13-inch baking dish. Use a regular brownie mix rather than a cake-style mix so the base stays fudgy.

• 1 box fudgy brownie mix, about 18 to 19 ounces
• 2 large eggs
• 1/2 cup neutral oil
• 1/4 cup water
• 1 cup creamy peanut butter
• 1/2 cup powdered sugar
• 1 teaspoon vanilla extract
• 1 cup semisweet chocolate chips
• 12 miniature peanut butter cups, halved
• 1/2 teaspoon flaky sea salt, optional
• Vanilla ice cream, for serving

If you use natural peanut butter, stir it very well before measuring so the oil is evenly distributed. Crunchy peanut butter is also delicious and adds extra texture. Check the brownie mix instructions in case your brand calls for a slightly different amount of oil or water.

How to Make It Step by Step

1. Heat the oven. Set the oven to 350°F. Grease a 9-by-13-inch baking dish with butter or nonstick spray. A metal pan gives slightly crispier edges, while glass keeps the center soft for a little longer.
2. Prepare the brownie batter. In a large bowl, whisk together the brownie mix, eggs, oil, and water until the dry streaks disappear. Do not overmix; a few small lumps are fine. Set the batter aside while you prepare the peanut butter layer.
3. Make the peanut butter mixture. Stir the peanut butter, powdered sugar, and vanilla in a medium bowl until smooth and thick. If it feels too stiff to spread, microwave it for 10 seconds and stir again.
4. Layer the filling. Spread half of the brownie batter in the prepared dish. Dollop the peanut butter mixture over the batter and gently spread it toward the edges. Sprinkle half of the chocolate chips and half of the peanut butter cup pieces over the peanut butter.
5. Add the top layer. Spoon the remaining brownie batter over the filling. It does not need to cover every inch; the batter will spread as it bakes. Finish with the remaining chocolate chips and peanut butter cup pieces.
6. Bake. Bake for 32 to 38 minutes, until the edges look set and the center is soft but not liquid. A toothpick inserted near the edge should show moist crumbs. Avoid testing the center where the peanut butter layer can make the toothpick look wetter than the brownie batter.
7. Rest and serve. Let the cake rest for 15 to 20 minutes. Sprinkle with flaky sea salt if using, then scoop it into bowls with vanilla ice cream. The center will thicken as it cools.

Tips and Variations

Do not overbake

The best texture is soft and fudgy, so begin checking a few minutes before the recipe’s upper bake time. The edges should look firm, while the middle should still have a slight wobble. If you prefer neat squares, bake for 5 to 8 minutes longer and cool the cake completely before cutting.

Make it extra crunchy

Sprinkle 1/2 cup chopped roasted peanuts over the top before baking. Crushed pretzels are another excellent option because their saltiness balances the chocolate. For a holiday version, add mini chocolate candies or a thin white chocolate drizzle after the cake cools.

Use a different chocolate base

Dark chocolate brownie mix makes the peanut butter taste even more pronounced. A blondie mix creates a softer, caramel-like dessert. If you use a cake mix instead, follow its package directions and expect a lighter, more cake-like result rather than a fudgy center.

Serve it for a party

Set out toppings such as whipped cream, chopped peanuts, chocolate sauce, caramel, and sliced bananas. For another peanut butter treat, compare this dessert with the quick peanut butter cup bake. Chocolate fans may enjoy the German chocolate dump cake, while fruit lovers can try the caramel apple éclair cake. A lighter no-bake option is this cherry cheesecake fluff.

Storage and Reheating

Cover cooled leftovers and refrigerate for up to 4 days. The texture becomes firmer when chilled, so warm individual servings in the microwave for 20 to 30 seconds. Add ice cream after reheating. You can also warm the covered baking dish in a 300°F oven for 10 to 15 minutes.

Freeze individual portions for up to 2 months. Wrap them well and thaw overnight in the refrigerator, then warm gently. The chocolate may lose a little of its original shine after freezing, but the flavor and fudgy texture remain delicious. For the best presentation, add fresh toppings after reheating.

Peanuts, milk, eggs, soy, and wheat may appear in the ingredients or packaged brownie mix. Read every label and avoid cross-contact when baking for someone with a food allergy. The FDA food-allergy guidance explains how major allergens are identified on packaged foods.

For the prettiest serving, add the ice cream while the cake is warm enough to soften it slightly but not so hot that it disappears immediately. A drizzle of chocolate sauce, a pinch of flaky salt, or a few chopped peanuts makes each bowl feel finished. The contrast between warm brownie, cool ice cream, and creamy peanut butter is the reason this dessert is best served by the spoonful.

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Frequently Asked Questions

What is peanut butter cup dump cake with brownie mix?

It is a layered dessert made by spreading brownie batter around a sweet peanut butter filling, then baking it with chocolate chips and peanut butter cups. The result is part brownie, part pudding cake, and part warm peanut butter dessert.

Can I use crunchy peanut butter?

Yes. Crunchy peanut butter gives the center small pieces of roasted peanut and adds a pleasant contrast to the soft brownie. Stir the jar well before measuring so the mixture is not overly oily.

Why is the center still soft after baking?

The peanut butter layer and melted chocolate keep the center soft, especially while the cake is warm. Let it rest for at least 15 minutes. If the brownie batter itself looks wet rather than fudgy, return the pan to the oven for 5 minutes.

Can I make this dessert without eggs?

Use the egg replacement recommended by your brownie mix manufacturer. Different mixes need different amounts of liquid, so follow the package’s egg-free directions before layering the peanut butter filling.

Can I prepare it ahead?

Assemble the dessert several hours ahead, cover it, and refrigerate it until you are ready to bake. Add about 5 minutes to the baking time if it goes into the oven cold, and remove the cover before baking.