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–+ servings
a stack of brownies with oreos on top.

Slutty Brownies Recipe

Course: Bars, Dessert
Cuisine: American
Prep Time: 10 minutes
Cook Time: 50 minutes
Total Time: 1 hour
Servings: 24 brownies
Calories: 379kcal
Author: Becky Hardin
These slutty brownies are thick, fudgy dessert bars made with layers of chocolate chip cookie dough, Oreo cookies, and rich brownie batter. They’re easy to make with boxed mixes, take just 10 minutes to prep, and always get rave reviews.
Print Recipe
US Customary - Metric

Equipment

  • Kitchen Scale (optional)
  • 9x13 Baking Pan

Ingredients

Chocolate Chip Layer

  • 17.5 ounces chocolate chip cookie mix (1 bag)*
  • ¼ cup semisweet chocolate chips
  • ½ cup salted butter melted (1 stick)
  • 1 large egg room temperature

Chocolate Sandwich Cookie Layer

  • 14.3 ounces Double Stuf Oreos (1 package)**

Brownie Layer

  • 18.3 ounces brownie mix (1 box)***
  • 1 cup semisweet chocolate chips
  • 2 large eggs room temperature
  • ¼ cup salted butter melted (½ stick)
  • ¼ cup milk

Instructions

  • Preheat oven to 350°F, line a 9x13-inch baking pan with parchment paper, and set aside.
  • In a medium bowl, stir the chocolate chips into the cookie mix.
    17.5 ounces chocolate chip cookie mix, ¼ cup semisweet chocolate chips
    ingredients for a chocolate chip cookie recipe.
  • Gently pour in the melted butter and egg, and mix thoroughly.
    ½ cup salted butter, 1 large egg
    chocolate chip cookie dough in a bowl with other ingredients.
  • Press the prepared cookie dough carefully into the bottom of your prepared pan.
    chocolate chip cookie bars in a baking pan.
  • Place the Oreos in an even single layer over the prepared cookie dough, breaking as needed to fit the pan.
    14.3 ounces Double Stuf Oreos
    oreo cookies in a baking pan on a marble countertop.
  • In a separate medium bowl, stir the chocolate chips into the brownie mix.
    18.3 ounces brownie mix, 1 cup semisweet chocolate chips
    a bowl of chocolate chips, eggs and oreo cookies.
  • Add the eggs, butter, and milk and stir to combine.
    2 large eggs, ¼ cup salted butter, ¼ cup milk
    a bowl of chocolate and oreos next to a mixing bowl.
  • Gently pour the brownie batter over the sandwich cookies, fully covering them in an even layer.
    oreo cookie bars in a baking pan.
  • Bake for 50 minutes, or until cooked through.
    a square of chocolate brownie in a baking pan.
  • Let cool completely before slicing into squares.

Notes

*I used Pillsbury chocolate chip cookie mix, but any brand works. Refrigerated chocolate chip cookie dough can be used to save time.
**Double Stuf Oreos give the best balance, but any flavor works.
***Use a family-size box of brownie mix, and prepare according to the box.
Tips:
  • It’s okay if some Oreos overlap or leave small gaps; gently press them into the cookie dough so they stay in place.
  • The brownie batter should be thick but pourable. If it feels too stiff, stir in 1-2 tbsp milk.
  • “Fudgy” and “chewy” mixes vary; adjust liquid as needed based on the box directions.
  • Bake your brownies on the center rack.
  • If the top browns too quickly, loosely tent with foil.
  • Brownies are done when the top is set and a toothpick comes out with moist crumbs, not wet batter.
  • Let cool completely before slicing; they firm up as they cool.
  • For cleaner cuts, chill for 30 minutes and wipe the knife between slices.
  • These Oreo brookies are super indulgent, so I cut mine into 24 pieces.
Storage: Store in an airtight container at room temperature for up to 4 days, in the refrigerator for up to 1 week, or freeze for up to 3 months.

Nutrition

Serving: 1brownie | Calories: 379kcal | Carbohydrates: 50g | Protein: 4g | Fat: 18g | Saturated Fat: 8g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 6g | Trans Fat: 0.3g | Cholesterol: 39mg | Sodium: 207mg | Potassium: 116mg | Fiber: 2g | Sugar: 31g | Vitamin A: 220IU | Calcium: 18mg | Iron: 3mg