Description
This M&M’s Peanut Butter Cake is soft, moist, and packed with rich peanut flavor. Topped with a creamy peanut butter chocolate frosting and a fun scattering of mini M&M’s, it’s the ultimate cake for peanut butter lovers!
Ingredients
Scale
For the Cake:
- 230g (1 cup / 2 sticks) unsalted butter, at room temperature
- 180g (1 cup) brown sugar
- 100g (½ cup) caster or granulated sugar
- 250g (1 cup) smooth peanut butter (Skippy or Jif recommended)
- 1 tsp vanilla extract
- 3 large eggs, at room temperature
- 2 tsp baking powder
- ¼ tsp salt
- 315g (2¼ cups) all-purpose (plain) flour
- 240ml (1 cup) full-fat (whole) milk
For the Peanut Butter Frosting:
- 115g (½ cup / 1 stick) unsalted butter, at room temperature
- 150g (1 cup) good-quality milk chocolate, melted
- 375g (3 cups) icing (powdered) sugar, sifted
- 2–3 tbsp full-fat (whole) milk, at room temperature
- 1 tbsp smooth peanut butter
- 180g (1 cup) mini M&M’s
Optional Add-Ons:
- Chocolate chips – mix into the batter for more chocolate flavor
- Chopped nuts – such as peanuts for added crunch
Instructions
- Preheat your oven to 350°F (175°C). Grease and line two 8-inch round cake pans.
- In a large mixing bowl, cream together the butter, brown sugar, and granulated sugar until light and fluffy.
- Beat in the peanut butter and vanilla extract.
- Add eggs one at a time, mixing well after each addition.
- In a separate bowl, whisk together the flour, baking powder, and salt.
- Alternately add the dry ingredients and milk to the wet ingredients, starting and ending with the flour. Mix until just combined.
- Divide the batter evenly between the prepared cake pans. Smooth the tops.
- Bake for 25–30 minutes or until a toothpick inserted in the center comes out clean. Let cool completely before frosting.
- To make the frosting, beat butter and peanut butter until creamy. Add in melted chocolate and mix until smooth.
- Gradually add powdered sugar and milk, beating until desired consistency is reached.
- Frost the cooled cakes and top with mini M&M’s.
Notes
- You can bake this as a sheet cake if preferred — adjust baking time accordingly.
- Store leftovers in an airtight container at room temperature for up to 3 days or refrigerate for longer shelf life.
- This cake freezes well without the frosting.
- Prep Time: 20 minutes
- Cook Time: 30 minutes
- Category: Dessert, Cake
- Method: Baking
- Cuisine: American
Nutrition
- Serving Size: 1 slice
- Calories: 480
- Sugar: 35g
- Sodium: 180mg
- Fat: 28g
- Saturated Fat: undefined
- Unsaturated Fat: undefined
- Trans Fat: undefined
- Carbohydrates: 50g
- Fiber: undefined
- Protein: 7g
- Cholesterol: undefined
Keywords: M&M's peanut butter cake, peanut butter chocolate cake, peanut butter frosting, kids birthday cake, fun party cake