Peanut Butter Cup Dump Cake Recipe With Cake Mix: No-Bake Chocolate Layered Bliss

This layered dessert combines the ease of cake mix with the decadence of peanut butter cups for a treat that’s impossible to resist. David declared it my best creation after the first bite.

No mixing bowls required—just layer the ingredients in a pan and let the oven do the work. The result is a rich, fudgy base topped with melted peanut butter cups that create pockets of creamy, chocolatey goodness.

The beauty lies in its simplicity: a box of cake mix, a few pantry staples, and peanut butter cups transform into something extraordinary. It’s the kind of dessert that disappears fast at gatherings.

Perfect for potlucks or when you need a quick, crowd-pleasing sweet. Here’s how to make it.

Ingredients for Peanut Butter Cup Dump Cake Recipe with Cake Mix

A box of cake mix and peanut butter cups create this no-fuss layered dessert everyone loves.

The cake mix is your base—any chocolate variety works, but devil’s food gives that extra-rich color. Reese’s peanut butter cups are the classic choice (the standard size, not minis). For the condensed milk, Eagle Brand is the most reliable at any grocery store. If you’re adding peanuts, get the dry-roasted kind in the baking aisle for best crunch.

No chocolate chips? Chop up a chocolate bar instead—it melts beautifully. Swap peanut butter cups for almond butter cups if you’re feeling fancy. The butter can be salted if that’s what you’ve got (just skip the added salt). Coconut oil works in a pinch for a dairy-free version, though the flavor changes slightly.

Store covered at room temp for 3 days, or refrigerate for up to 5 days. The flavors actually deepen overnight. Leftovers reheat beautifully—10 seconds in the microwave makes it taste fresh-baked. Freezes well too, 3 months if wrapped tight.

Step-by-Step Instructions for Peanut Butter Cup Dump Cake

Here’s how I layer this no-bake treat without turning on the oven.

Step 1: Prepare the Base Layer with Cake Mix

Start by spreading the 1 box Chocolate Cake Mix evenly across the bottom of a 9×13-inch baking dish. I press it down gently with the back of a spoon to create a uniform layer. This dry base will absorb the moisture from the layers above, transforming into a fudgy, cake-like texture as it sits.

Don’t pack it too tightly—just enough to remove any air pockets. The mix should look smooth and level, covering the entire bottom of the dish. This step sets the foundation for the entire dessert.

Step 2: Add the Peanut Butter Cup Layer

Unwrap all 24 pieces Peanut Butter Cups and arrange them in a single layer directly on top of the cake mix. I place them close together, slightly overlapping if needed, to ensure every bite has a gooey, chocolate-peanut butter surprise. The heat from the next layers will soften them into a rich, melted consistency.

If any peanut butter cups are larger or irregularly shaped, I break them into smaller pieces to fill gaps. This ensures even coverage and a consistent texture throughout the dish.

Step 3: Pour the Sweetened Condensed Milk Mixture

In a separate bowl, mix the 1 can Sweetened Condensed Milk, 1 tsp Vanilla Extract, and 0.25 tsp Salt until smooth. Pour this mixture evenly over the peanut butter cups, making sure it seeps into the cake mix layer below. The condensed milk acts as the glue, binding everything together.

Use a spatula to gently spread it around, ensuring it reaches all the edges and corners. You’ll notice the cake mix start to absorb the liquid almost immediately—that’s exactly what you want.

Step 4: Top with Chocolate Chips and Peanuts

Sprinkle the 1 cup Chocolate Chips evenly over the condensed milk layer. Then, add the 0.5 cup Chopped Peanuts on top for a satisfying crunch in every bite. These toppings will soften slightly but retain their texture, adding contrast to the creamy layers below.

Press down lightly on the chocolate chips and peanuts so they stick to the condensed milk layer. This prevents them from shifting around when you add the final butter layer.

Step 5: Drizzle with Melted Butter and Finish

Melt the 1 cup Unsalted Butter and drizzle it evenly over the entire dish. The butter will seep through all the layers, enhancing the flavors and creating a rich, decadent texture. I tilt the dish slightly to ensure the butter covers every spot.

Cover the dish and refrigerate for at least 4 hours, or overnight if possible. This chilling time allows all the layers to set and meld together. For an extra touch, I sometimes dust the top with 0.25 cup Powdered Sugar or drizzle with 1 cup Heavy Cream before serving.

Storing and Reheating This peanut butter cup dump cake recipe with cake mix

Room Temperature Storage

Let this dessert set completely before covering with plastic wrap or aluminum foil. It stays fresh at room temperature for up to 3 days. I always keep it in a cool, dry spot away from direct sunlight. The flavors actually improve after 24 hours as everything melds together. ❄️

Refrigerator Storage

For longer storage, refrigerate in an airtight container for up to 5 days. David swears the chilled version tastes even better—the peanut butter cups firm up slightly, giving a nice contrast to the fudgy base. Just let it sit at room temp for 15-20 minutes before serving.

Freezing for Later

This freezes beautifully for up to 3 months. Wrap individual slices in plastic wrap, then place in a freezer-safe bag. I label with the date so I don’t forget. Thaw overnight in the fridge before serving. The texture stays surprisingly good after freezing.

Reheating Methods

For a warm treat, microwave individual portions for 10-15 seconds. The peanut butter cups will get gooey again, almost like fresh-baked. Avoid overheating—this dessert is best just slightly warmed. I sometimes add a scoop of vanilla ice cream on top for an extra indulgent treat.

Serving from Chilled

If serving straight from the fridge, let it sit at room temperature for 20-30 minutes first. This softens the layers just enough for easy serving. Use a sharp knife dipped in hot water for clean slices. The contrast between the cool, firm base and melted peanut butter is divine. 💛

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