banana cupcakes with tiger butter frOsting - Sugar Booger Sweets

Ingredients

• cooking spray
• ½ cup unsalted butter, room temperature
• ¾ cup sugar
• ½ cup brown sugar
• 3 large eggs, room temperature
• 1 ½ cups very ripe bananas, mashed
• 2 tsp vanilla extract
• 2 cups all-purpose flour, sifted
• 1 tsp baking soda
• ½ tsp salt
• ½ tsp cinnamon
• ½ cup buttermilk
• ½ cup chopped walnuts
• 3 large egg whites, room temperature
• ½ cup sugar
• 2 sticks unsalted butter, softened but still cool, cut into 1/2 inch pieces
• 2 oz white chocolate, melted and cooled to room temperature
• 4 tbsp natural peanut butter