Prepare the brownie mix according to package directions, using a 13x9x2-inch baking pan and the directions for chewy (not cakelike) brownies. Bake according to directions.Advertisement
Sprinkle baked brownies with marshmallows and return to oven for 3 to 5 minutes or until golden. Cool in the pan on a wire rack.
In a saucepan, combine chocolate pieces, peanut butter, and butter or margarine. Heat and stir until the chocolate is melted. Remove from heat; stir in the cereal. Pour evenly over marshmallows.
Refrigerate until topping is set. Cut into bars. Serve at room temperature. Makes 36 bars.
Instead of melting the chocolate, peanut butter, and butter or margarine in a saucepan on the range top, melt them in your microwave oven. Place the three ingredients in a microwave-safe mixing bowl and microcook the mixture on 100 percent power (high) for 1 to 2 minutes or until melted, stirring once. Stir in the cereal and continue as directed above.