4-1/2 cups unsalted butter, melted, cooled to room temperature
9 packages devils food cake mix
6-3/4 cups creamy peanut butter, warm
2-1/4 lbs. large marshmallows, quartered
Preheat oven to 350°F. Combine butter and dry cake mixes in a
bowl until crumbly.
Reserve 7 lbs. of mixture. Pat remaining crumb mixture into 9 ungreased 9x13 inch pans or equivalent. Combine peanut butter and marshmallows in a bowl. Spread evenly over crumb mixture in the pans.
(If space and bowls are a problem, mix each cake mix separately)
Crumble reserved cake mixture over top and bake 20 minutes.
Let cool before cutting into bars.