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5 from 2 votes

Cookies 'n Cream Seven Layer Bars

Gooey, soft and chewy, these bars are loaded with the classic chocolate cookies & cream flavors of your favorite sandwich cookies! A glass of icy milk is required!
Prep Time10 mins
Cook Time32 mins
Total Time42 mins
Course: Bars
Servings: 24
Author: Hayley Parker, The Domestic Rebel


  • 1 box white cake mix
  • 1 egg
  • 1/2 cup oil
  • About 20-25 Oreo cookies coarsely chopped
  • 1 cup milk chocolate chips
  • 1 cup white chocolate chips
  • 1 cup Hershey's Cookies & Cream chocolate bars roughly chopped
  • 1 7 oz jar marshmallow fluff
  • 1 14 oz can sweetened condensed milk


  • Preheat oven to 350 degrees F. Line a 13x9" baking pan with foil, extending the sides of the foil over the edges of the pan. Mist the foil with cooking spray and set aside.
  • In a large bowl, combine the cake mix, egg and oil until a soft dough forms. Press the dough evenly into the prepared pan and bake for approx. 12 minutes.
  • Remove the pan from the oven, but keep the oven on. Top the crust evenly with the chocolate chips, white chips, Oreo cookie pieces and Hershey's bars. In a small bowl, whisk together the sweetened condensed milk and the marshmallow fluff; pour the mixture evenly over the top of the bars.
  • Return to the oven and bake for an additional 15-20 minutes or until the center appears set and the top is golden and bubbly. Cool the bars COMPLETELY in the pan before cutting into squares. I recommend letting them stand overnight so the marshmallow fluff has a chance to set up completely. Serve! Store leftovers airtight at room temperature for several days.