banana cupcakes with peanut butter frosting

Ingredients For banana cupcakes with peanut butter frosting

• CUPCAKES:
• 1 1/4 c

  all purpose flour
• 1 1/2 tsp

  baking powder
• 1/2 tsp

  baking soda
• 1/4 tsp

  salt
• 2 lg

  very ripe bananas, peeled
• 1/2 c

  sour cream
• 1 1/2 tsp

  vanilla extract
• 3/4 c

  sugar
• 1/2 c

  unsalted butter (1 stick) room temperature
• 1 lg

  egg
• 1 lg

  egg yolk
• FROSTING:
• 1 1/2 c

  powdered sugar
• 8 oz

  cream cheese, room temperature
• 1/2 c

  unsalted butter (1 stick) room temperature
• 1/2 c

  smooth peanut butter (do not use old-fashioned or freshly ground)
• chopped lightly salted roasted peanuts, optional