Deluxe Marshmallow Bars

Why I Love This Recipe
When I saw these on Good Eats 'n Treats I knew I had to try them. They are worth making. Next time I will add more peanut butter to them.
http://canadianbakertoo.blogspot.com/
Ingredients You'll Need
3/4 cup butter
1-1/2 cups sugar
3 eggs
1 tsp vanilla extract
1-1/3 cups all purpose flour
3 tbsp baking cocoa
1/2 tsp baking powder
1/2 tsp salt
1/2 cup chopped nuts, optional (I omitted these)
4 cups miniature marshmallows
Topping:
1-1/3 cup chocolate chips
1 cup peanut butter (1 1/2 cups peanut butter)
3 tbsp butter
2 cups crisp rice cereal
Directions
In a mixing bowl, cream butter and sugar.
Add eggs and vanilla; beat until fluffy.
Combine flour, cocoa, baking powder and salt; add to creamed mixture.
Stir in nuts if desired.
Spread in a greased 15 x 10 x 1" pan.
Bake at 350F for 15-18 minutes.
Sprinkle marshmallows evenly over cake; return to oven for 2-3 minutes.
Using a knife dipped in water, spread the melted marshmallows evenly over cake.
Cool. (I did not spread them, when I took them out of the oven they seemed fine the way they were. )
For topping, combine chocolate chips, peanut butter and butter in a small saucepan.
Cook over low heat, stirring constantly, until melted and well blended.
Remove from heat; stir in cereal.
Immediately spread over bars.
Chill.
Yield: 3 dozen