Stir Pillsbury Classic Chocolate Cake Mix, eggs and oil together.
Spread into a greased 9×13 inch pan.
Bake at 350 degrees for 12-15 minutes (or for convection oven bake at 340 degrees for 10-13 minutes.)
Cool completely.
For the Peanut Butter Rice Krispies Layer:
Melt butter and marshmallow in microwave at 50% power for 45 seconds, stir well. Continue to heat until completely melted.
Stir in Jif peanut butter until completely mixed together. (You could also microwave the peanut butter into mixture 10-20 seconds at a time until melted.)
Stir in Pillsbury Classic Vanilla Cake Mix a little at a time.
Stir in Rice Krispies cereal 1 cup at a time. Mixture will thicken as the cereal is added.
Fold in about 1/4 c Reese’s Pieces candies.
Place Peanut Butter Rice Krispies layer on top of the cooled chocolate cookie layer, pressing down with a oil sprayed spatula until flat.
Melt as much Pillsbury Creamy Supreme Chocolate Fudge Frosting as you’d like in a glass container in microwave for 10-15 seconds, stir.
Drizzle as much melted frosting as you’d like on top of the bars.
Add Mini Reese’s Peanut Butter Cups and Reese’s Pieces Candies on top.