Deluxe Chocolate Marshmallow Bars

Directions

1. Preheat oven to 350°. In a bowl, cream butter and sugar until light and fluffy, 5-7 minutes. Add eggs, 1 at a time, beating well after each addition. Beat in vanilla.
   
   Combine flour, cocoa, baking powder and salt; gradually add to creamed mixture. Stir in nuts if desired. Spread into a greased 15x10x1-in. baking pan.
2. Bake until set, 15-18 minutes or until set. Sprinkle with marshmallows; bake 2-3 minutes longer or until melted. Place pan on a wire rack. Using a knife dipped in water, spread marshmallows evenly over the top. Cool completely.
3. For topping, combine chocolate chips, peanut butter and butter in a small saucepan. Cook and stir over low heat until blended. Remove from the heat; stir in Rice Krispies. Immediately spread over bars. Chill until set.