You are here: Home » Recipes » Peanut Butter Brownie Muffins Peanut Butter Brownie Muffins Recipe by AFLY Yield 40-48 servings Mini peanut butter cups create a surprise center in these one-bite brownies. PrintEmail Ingredients 1 (15-ounce) package brownie mix 1/3 cup hot water1/4 cup oil1 egg48 miniature peanut butter cups Instructions Preheat oven to 350F. Combine brownie mix, water, oil and egg. Beat well. Fill paper-lined mini muffin tin cups 1/2 full with brownie mixture. Press 1 peanut butter cup into batter in each cup. Bake 15 to 18 minutes, or until set. Let cool completely. Makes 40 to 48.