M&M Peanut Butter Cake with Fluffy Frosting - Quickie Recipe

Ingredients

• 2 1/4 cups (280 g) all-purpose flour, divided
• 2 teaspoons baking powder
• 1/2 teaspoon baking soda
• 1/2 teaspoon fine salt
• 1/2 cup (113 g) unsalted butter, softened
• 3/4 cup (190 g) creamy peanut butter
• 3/4 cup (150 g) granulated sugar
• 1/2 cup (105 g) packed light brown sugar
• 3 large eggs, room temperature
• 2 teaspoons vanilla extract
• 1 cup (240 ml) buttermilk, room temperature
• 1 cup (170 g) Peanut Butter M&M's, roughly chopped
• 3/4 cup (170 g) unsalted butter, softened
• 3 1/2 cups (420 g) powdered sugar
• 1 teaspoon vanilla extract
• 1/4 teaspoon fine salt
• 4-6 tablespoons heavy cream
• 3/4 cup (125 g) Peanut Butter M&M's, whole or chopped, for decorating