Marshmallow Peanut Butter Fudge Bars
4 1/2 cups unsalted butter, melted, cooled to room temperature
9 (18.25 ounce) boxes devil's food cake mix
6 3/4 cups creamy peanut butter, warm
2 1/4 pounds large marshmallows, quartered
Heat oven to 350 degrees F.
Combine butter and dry cake mixes in a bowl until crumbly. Reserve 7 pounds of mixture.
Pat remaining crumb mixture into 9 ungreased 9 x 13-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 for 20 minutes.
Let cool before cutting into bars.
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