1 box brownie mix (plus ingredients called for on the box) 1 cup semi-sweet chocolate chips 1/2 cup peanut butter 1 Tbsp. butter or margarine
Instructions
Make the brownie batter according to the package directions. Pour into a greased 8×8-inch pan and bake according to the directions on package. Let cool slightly.
To make the topping: In a microwave-safe bowl, combine chocolate chips, peanut butter, and butter. Microwave in 30-second intervals, stirring between each, until melted and smooth.
Spread the warm topping evenly over the baked brownies.
Let the topping set slightly before cutting into squares.