Ingredients:
For the Cake Batter:
- 1 box chocolate cake mix (plus ingredients specified on the box – eggs, oil, water)
- 1/2 cup unsalted butter, melted
- 1 cup buttermilk
For the Peanut Butter Filling:
- 1 cup creamy peanut butter
- 1/2 cup powdered sugar
For the Topping:
- 1 cup Reese’s Peanut Butter Cups, chopped
- 1/2 cup chocolate chips
- 1/2 cup chopped peanuts

Directions:
- Preheat your oven to 350°F (175°C). Grease and flour a 9×13-inch baking dish.
- Prepare the chocolate cake batter according to the instructions on the box. Once mixed, add the melted butter and buttermilk, and stir until smooth.
- In a separate bowl, mix together the creamy peanut butter and powdered sugar until well combined. Set aside.
- Pour the chocolate cake batter into the prepared baking dish, spreading it evenly.
- Drop spoonfuls of the peanut butter mixture onto the chocolate batter. Using a knife or spatula, swirl the peanut butter mixture into the chocolate batter to create a marbled effect.
- Sprinkle the chopped Reese’s Peanut Butter Cups, chocolate chips, and chopped peanuts evenly over the top of the batter.
- Bake in the preheated oven for 40-45 minutes or until a toothpick inserted into the center comes out with moist crumbs (not wet batter).
- Remove the cake from the oven and let it cool for at least 15 minutes before serving.
Serving:
Slice and serve this indulgent Reese’s Peanut Butter Cup Earthquake Cake on its own or with a scoop of vanilla ice cream for an extra treat. It’s a heavenly dessert for peanut butter and chocolate lovers alike!