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M&M's Peanut Butter Cake with Peanut Butter Frosting displayed on a cake stand
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M&M’s Peanut Butter Cake

A delightful union of tender peanut butter chocolate cake layered with creamy peanut butter frosting and topped with colorful M&M’s.
Prep Time30 minutes
Cook Time35 minutes
Total Time1 hour 30 minutes
Course: Cake, Dessert
Cuisine: American
Keyword: Chocolate Cake, Dessert Recipe, Frosting Recipe, M&M's Cake, Peanut Butter Cake
Servings: 12 servings
Calories: 450kcal

Ingredients

For the cake

  • 2 cups all-purpose flour Silky and fine, it forms the backbone of your cake.
  • 1 cup granulated sugar This sweet sparkle elevates the cake.
  • 1 cup brown sugar Adds depth and moisture.
  • 1 cup unsweetened cocoa powder Velvety touch of chocolate.
  • 1 teaspoon baking powder Helps the cake rise.
  • 2 teaspoons baking soda Works with baking powder for fluffy texture.
  • 1/2 teaspoon salt Enhances all flavors.
  • 1 cup buttermilk Imparts moisture and creaminess.
  • 1/2 cup vegetable oil Keeps the cake light and moist.
  • 2 large eggs For structure and richness.
  • 2 teaspoons vanilla extract Aromatic addition.
  • 1 cup hot water Enhances cocoa flavor.
  • 1 cup M&M’s Peanut Butter Brings bursts of flavor.

For the frosting

  • 1 cup unsalted butter, softened Foundation for frosting.
  • 1 cup creamy peanut butter Rich and satisfying.
  • 4 cups powdered sugar Sweetens the frosting.
  • 1/4 cup heavy cream Adds smoothness.
  • 1 teaspoon vanilla extract Completes the frosting.
  • 1 cup M&M’s Peanut Butter for decoration Adds a colorful touch.

Instructions

Preparation

  • Preheat the oven to 350°F (175°C) and prepare two 9-inch round cake pans by greasing and flouring them.
  • In a large bowl, whisk together flour, granulated sugar, brown sugar, cocoa powder, baking powder, baking soda, and salt.
  • Pour in buttermilk, vegetable oil, eggs, and vanilla extract. Mix on medium speed until combined.
  • Gradually stir in hot water until batter is smooth.
  • Fold in M&M’s Peanut Butter.
  • Evenly divide batter between prepared cake pans.

Baking

  • Bake for 30–35 minutes or until a toothpick inserted comes out clean.

Cooling

  • Allow the cakes to cool in the pans for 10 minutes before transferring to a wire rack.

Frosting

  • In a large mixing bowl, beat softened butter and peanut butter until smooth.
  • Gradually add powdered sugar and heavy cream, mixing in vanilla extract until combined.

Assembly

  • Spread frosting between layers and on top and sides of the cake.
  • Decorate with extra M&M’s Peanut Butter.

Notes

Let batter rest for better flavor infusion. Ensure ingredients are at room temperature for the best results.