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M&M's Peanut Butter Cake with creamy peanut butter frosting on a plate
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M&M's Peanut Butter Cake with Peanut Butter Frosting

A rich and moist cake infused with creamy peanut butter and colorful M&M's, paired with a decadent peanut butter frosting—perfect for any celebration.
Prep Time15 minutes
Cook Time35 minutes
Total Time50 minutes
Course: Cake, Dessert
Cuisine: American
Keyword: celebration cake, Chocolate Cake, frosting, M&M's Cake, Peanut Butter Cake
Servings: 8 servings
Calories: 450kcal

Ingredients

For the Cake

  • 2 cups all-purpose flour A staple that creates a tender crumb.
  • 1 cup granulated sugar Sweetness that balances the flavors in the cake.
  • 1 cup brown sugar Adds a rich, caramel undertone.
  • 1 cup unsweetened cocoa powder Infuses a deep chocolate flavor that pairs beautifully with peanut butter.
  • 1 teaspoon baking powder Essential leavening agent.
  • 2 teaspoons baking soda Essential leavening agent.
  • 1/2 teaspoon salt Enhances sweetness and depth of flavor.
  • 1 cup buttermilk Provides extra moisture and a tangy flavor.
  • 1/2 cup vegetable oil Helps keep the cake moist and tender.
  • 2 large eggs Bind the ingredients together for perfect texture.
  • 2 teaspoons vanilla extract Adds a warm aroma.
  • 1 cup hot water Ensures a soft, velvety batter.
  • 1 cup M&M’s Peanut Butter Provides bursts of peanut buttery sweetness.

For the Frosting

  • 1 cup unsalted butter, softened The creamy base of your frosting.
  • 1 cup creamy peanut butter Rich and smooth, delivering the peanut flavor.
  • 4 cups powdered sugar Sweetens and thickens the frosting.
  • 1/4 cup heavy cream Adds a luxurious texture.
  • 1 teaspoon vanilla extract Enhances the overall flavor.
  • M&M’s Peanut Butter for decoration Brightens the cake and offers appealing crunch.

Instructions

Preparation

  • Preheat your oven to 350°F (175°C) and grease and flour two 9-inch round cake pans.
  • In a large mixing bowl, whisk together the flour, granulated sugar, brown sugar, cocoa powder, baking powder, baking soda, and salt until well mixed.
  • Add the buttermilk, vegetable oil, eggs, and vanilla extract to the dry ingredients. Mix until well combined.
  • Gradually stir in hot water until the batter is smooth. Gently fold in the M&M’s Peanut Butter.
  • Divide the batter evenly between the prepared cake pans and bake for 30-35 minutes until a toothpick comes out clean.
  • Allow the cakes to cool in the pans for 10 minutes, then transfer to a wire rack to cool completely.

Frosting Preparation

  • In a large bowl, beat the softened butter and creamy peanut butter until smooth.
  • Gradually add powdered sugar and heavy cream, alternating between them, until the frosting is creamy. Mix in the vanilla extract.

Assembly

  • Place one cooled cake layer on a serving plate and spread the frosting on top. Add the second layer and frost the top and sides.
  • Decorate the top with additional M&M’s Peanut Butter.

Notes

For a healthier twist, substitute half of the flour with whole wheat flour. Ensure that cakes are cooled completely before frosting to avoid melting. Store leftovers in an airtight container.