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Reese’s Peanut Butter Earthquake Cake

Lisa

By Lisa

Feb 26, 2026

15 min prep
35 min cook
12 servings
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Reese’s Peanut Butter Earthquake Cake

Welcome to a chocolate lover's paradise! This Reese’s Peanut Butter Earthquake Cake is the ultimate indulgence, bringing together rich chocolate and creamy peanut butter in a delightful dance of flavor and texture. With its gooey swirls and chunks of Reese’s cups, it’s perfect for any gathering or a cozy night in.

Get ready to impress your friends and family with this decadent dessert that’s as fun to make as it is to eat. Let’s dive into why this cake deserves a spot in your baking repertoire!

Why You'll Love This Recipe

  • Decadent Flavor Combination: The rich chocolate cake pairs perfectly with the creamy peanut butter filling, creating a flavor explosion in every bite.
  • Easy to Make: With just a few simple steps, you can whip up this show-stopping dessert in no time!
  • Perfect for Any Occasion: Whether it’s a birthday, potluck, or just a sweet treat for yourself, this cake is sure to impress.
  • Melt-in-Your-Mouth Goodness: Each slice offers a gooey, molten center that will leave you craving more.

About the Ingredients

Chocolate Cake Mix

This is the base of our cake, providing a rich chocolate flavor and a light, fluffy texture that pairs perfectly with the creamy layers above.

Water

Water helps to hydrate the cake mix, ensuring that the cake bakes up moist and tender, with a lovely crumb.

Vegetable Oil

Using vegetable oil adds moisture and richness to the cake, making it incredibly soft and indulgent.

Large Eggs

Eggs act as a binding agent, helping to create structure in the cake while also adding richness and flavor.

Creamy Peanut Butter

The star of this cake! Creamy peanut butter provides that unmistakable nutty flavor and a luscious texture that swirls beautifully into the chocolate batter.

Cream Cheese

Softened cream cheese adds a tangy richness to the peanut butter filling, making it creamy and smooth, perfect for that luxurious mouthfeel.

Unsalted Butter

Melted butter enhances the flavor and richness of the peanut butter mixture, giving it an irresistible, decadent quality.

Powdered Sugar

This sweetener is essential for balancing the flavors in the peanut butter filling, ensuring it’s perfectly sweet and smooth.

Vanilla Extract

Vanilla adds a warm, aromatic note that complements the chocolate and peanut butter beautifully, enhancing the overall flavor profile.

Reese’s Peanut Butter Cups

Chopped Reese’s cups provide crunchy bites of chocolate and peanut butter throughout the cake, adding delightful texture and bursts of flavor.

Tips & Tricks

Grease Your Pan Well

To ensure easy removal of the cake, generously grease your baking dish with butter or non-stick spray before adding the batter.

Swirling Technique

When swirling the peanut butter mixture into the cake batter, use a knife in a figure-eight motion for beautiful marbling without overmixing.

Check Oven Temperature

Ovens can vary, so make sure yours is properly calibrated to prevent over or under-baking. An oven thermometer can help!

Cool Before Serving

Let the cake cool slightly before cutting into it; this will help the layers set and make for cleaner slices.

Pro Tips

  • Use Room Temperature Ingredients: Ensure your cream cheese and eggs are at room temperature for a smoother filling and better texture.
  • Don’t Overmix the Batter: Mix just until combined to keep the cake light and fluffy.
  • Check for Doneness: A toothpick inserted in the center should come out with a few moist crumbs, not wet batter.
  • Garnish Creatively: Add a sprinkle of crushed Reese’s on top for an extra touch of decadence and visual appeal.

Step-by-Step Instructions

Preheat Your Oven

Start by preheating your oven to 350°F (175°C) and greasing a 9x13-inch baking dish to ensure nothing sticks!

Prepare the Cake Batter

In a large mixing bowl, combine the chocolate cake mix, water, vegetable oil, and eggs. Mix until everything is well blended and smooth. Pour this luscious batter into your prepared baking dish.

Create the Peanut Butter Mixture

In a separate bowl, combine the creamy peanut butter, softened cream cheese, melted butter, powdered sugar, and vanilla extract. Mix until the filling is velvety smooth and creamy.

Assemble the Cake

Drop spoonfuls of the peanut butter mixture over the chocolate cake batter. Take a knife and swirl the peanut butter mixture into the chocolate batter for a beautiful marbled effect.

Add the Finishing Touches

Sprinkle the chopped Reese’s Peanut Butter Cups over the top of the cake. Bake in the preheated oven for 35-40 minutes, or until a toothpick comes out mostly clean. Allow cooling slightly before serving.

Delicious Variations

Nutty Chocolate Swirl

Add chopped walnuts or pecans to the peanut butter mixture for an extra crunch and nutty flavor that complements the chocolate.

Chocolate Ganache Topping

Drizzle a rich chocolate ganache over the cooled cake for an extra layer of chocolatey goodness.

Gluten-Free Option

Substitute the chocolate cake mix with a gluten-free version to make this cake accessible for gluten-sensitive friends!

How to Store Reese’s Peanut Butter Earthquake Cake

Refrigerator

Store leftovers in an airtight container in the refrigerator for up to 5 days.

Freezer

Wrap slices in plastic wrap and foil, then freeze for up to 3 months. Thaw in the refrigerator before serving.

Reheating

Reheat individual slices in the microwave for about 15-20 seconds for a warm, gooey treat!

Frequently Asked Questions

Can I use a different type of nut butter?

Absolutely! Almond butter or cashew butter can be used for a unique twist on the traditional flavor.

Can I make this cake ahead of time?

Yes! You can bake the cake a day in advance and store it in the refrigerator until you're ready to serve.

What should I serve with this cake?

A scoop of vanilla ice cream or a dollop of whipped cream pairs beautifully with this rich dessert!

How do I know when the cake is done?

The cake is done when a toothpick inserted in the center comes out mostly clean with just a few moist crumbs.

Now that you have this luscious recipe for Reese’s Peanut Butter Earthquake Cake, it’s time to gather your ingredients and start baking! Your kitchen will fill with the delightful aroma of chocolate and peanut butter, and soon, you’ll be indulging in a slice of heaven. Enjoy!

Reese’s Peanut Butter Earthquake Cake

Reese’s Peanut Butter Earthquake Cake

This rich and gooey Reese’s Peanut Butter Earthquake Cake is a chocolate lover’s dream — swirled with creamy peanut butter filling, studded with Reese’s cups, and baked to molten perfection. Perfect for parties or indulgent nights in!

15 min
Prep Time
35 min
Cook Time
12
Servings
350 kcal
Calories

Ingredients

Instructions

  1. 1 Preheat oven to 350°F (175°C). Grease a 9x13-inch baking dish.
  2. 2 In a large bowl, mix the chocolate cake mix, water, vegetable oil, and eggs until well combined. Pour the batter into the prepared baking dish.
  3. 3 In a separate bowl, combine the peanut butter, cream cheese, melted butter, powdered sugar, and vanilla extract. Mix until smooth.
  4. 4 Drop spoonfuls of the peanut butter mixture over the cake batter. Use a knife to swirl the peanut butter mixture into the batter.
  5. 5 Sprinkle the chopped Reese’s Peanut Butter Cups evenly over the top.
  6. 6 Bake for 35-40 minutes, or until a toothpick inserted into the center comes out mostly clean.
  7. 7 Allow the cake to cool slightly before serving. Enjoy warm or at room temperature.

Chef's Note

For extra peanut butter flavor, drizzle melted Reese’s chips over the cooled cake. You can substitute chocolate chunks or peanut butter chips for the Reese’s cups. Store leftovers covered at room temperature for up to 3 days or refrigerate for a fudgier texture.

Servings: 12

Cuisine: American

Course: Dessert

Nutrition (per serving): 12gg protein