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Ultimate Customizable Cake Mix Cookie Bars: Quick, Chewy, and Easy

A stack of four rich, chewy chocolate chip cake mix cookie bars piled on a white plate.

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Make these soft, chewy cake mix cookie bars using just a few staple ingredients. This foolproof recipe is fast to prepare and perfect for potlucks or any sweet craving.

Ingredients

Scale
  • 1 box (15.25 oz) cake mix (Yellow, White, or Chocolate recommended)
  • 2 large eggs
  • 1/2 cup melted butter or vegetable oil
  • 1 cup add-ins (chocolate chips, M&Ms, nuts, or sprinkles)

Instructions

  1. Preheat your oven to 350°F (175°C). Line a 9×13 inch baking pan with parchment paper, leaving an overhang for easy removal.
  2. In a medium bowl, combine the dry cake mix, eggs, and melted butter or oil. Mix until just combined. Do not overmix.
  3. Fold in your chosen add-ins, such as chocolate chips or M&Ms, until evenly distributed throughout the dough.
  4. Press the dough evenly into the prepared baking pan.
  5. Bake for 18 to 22 minutes, or until the edges are lightly golden and a toothpick inserted near the center comes out with moist crumbs attached.
  6. Let the bars cool completely in the pan on a wire rack before lifting them out using the parchment overhang.
  7. Cut into squares and serve.

Notes

  • For a richer, softer bar, substitute the oil with 1/2 cup of melted, unsalted butter.
  • To make Peanut Butter Swirl Bars, reserve 1/3 of the dough and mix 1/2 cup of creamy peanut butter into the remaining 2/3 of the dough. Layer the plain dough, then the peanut butter dough, and swirl gently with a knife before baking.
  • Use a white or yellow cake mix for a Snickerdoodle variation; after pressing the dough into the pan, mix 2 tablespoons of sugar with 1 teaspoon of cinnamon and sprinkle evenly over the top before baking.

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