– 1/2 Cup Butter, 1 Stick – 3/4 Cup Brown Sugar, Packed – 2 Large Egg – 1 Teaspoon Vanilla Extract – 3 Large Ripe Bananas, Mashed – 1/2 Cup Peanut Butter – 2 Cups All Purpose Flour – 1 Teaspoon Baking Powder – 1 Teaspoon Baking Soda – 1/2 Teaspoon Salt – 1/4 Cup Milk