1 yellow cake mix
1 egg
1/2 c. unsalted butter, softened
1/3 c. creamy peanut butter
1/2 c. frozen mini marshmallows
1/2 c. milk chocolate chips
1/3 c. white chocolate chips
3/4 c. Reese's Pieces Candy
1 (14 oz.) can sweetened condensed milk
1/4 c. milk chocolate chips + 2 Tbl. peanut butter, for drizzle
Preheat oven to 350 degrees. Combine cake mix, egg, butter and 1/3 cup peanut butter and mix together until a dough forms. Press into the bottom of a 9x13-inch baking pan that has been lined with parchment paper and sprayed with cooking spray. Bake for 10 minutes.
Remove from oven and top with frozen marshmallows, 1/2 cup chocolate chips, white chocolate chips and Reese's Pieces Candy. Pour the sweetened condensed milk over the top. Bake for 20-22 minutes. The marshmallows will get very brown. If you don't want them to brown as much, tent a piece of foil over the top for the last few minutes of baking. Cool completely. Melt 1/4 cup milk chocolate chips and 2 Tablespoons of peanut butter in the microwave, stirring every 30 seconds, until smooth and creamy. Use a fork and drizzle over cooled bars. Cut into bars and serve. Makes 15 bars.
slightly adapted from: Le Creme De La Crumb