Delicous Brownie Krispies

1 box brownie mix + ingredients to make them. I used Western Family original.
4 cups mini marshmallows
1 1/3 cups semi-sweet chocolate chips
1 cup creamy Peanut Butter
3 TBS butter
2 cups Rice Krispie type cereal
Bake brownies according to package directions in a greased 9×13″ baking pan. Two minutes before they are supposed to be done, pull brownies from the oven and sprinkle marshmallows across top. Return to oven for 2 minutes to soften marshmallows. Remove from oven and cool completely.
For Topping: combine chocolate chips, peanut butter, and butter in a bowl. Heat in microwave for 30 seconds at a time until mixture is melted and smooth. Add cereal and stir to coat. Pour over marshmallow layer and spread evenly. Place brownies in the refrigerator for at least an hour until chilled.