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Halloween Oreo Brownies Recipe

4.5 from 50 reviews

Delightfully rich and fudgy Halloween Oreo Brownies featuring coarsely crushed Oreo cookies folded into the batter and a spooky green buttercream frosting. Topped with themed Oreos, candy eyes, and festive sprinkles, these brownies are perfect for Halloween celebrations and sure to impress both kids and adults with their creamy texture and festive decorations.

Ingredients

Scale

Brownie Batter

  • 2/3 cup unsalted butter, melted
  • 1/4 cup vegetable oil
  • 1 cup granulated sugar
  • 1/3 cup brown sugar
  • 2 large eggs, cold
  • 1 tsp pure vanilla extract
  • 2/3 cup unsweetened cocoa powder, sifted
  • 1/2 cup all-purpose flour, spooned and leveled
  • 1/2 tsp salt
  • 15 Oreo cookies, coarsely crushed

Green Buttercream Frosting

  • 1 cup unsalted butter, softened
  • 4 cups powdered sugar, sifted
  • 1/2 tsp pure vanilla extract
  • 34 tbsp milk or heavy cream
  • Green gel food coloring
  • Pinch of salt

Decoration

  • 5 Halloween-themed Oreo cookies (for topping)
  • Edible candy eyes
  • Assorted Halloween sprinkles (optional)
  • Melting chocolate (white or dark, optional, for decoration)

Instructions

  1. Prepare Pan & Oven: Preheat your oven to 350°F (175°C). Line a 9×13 inch baking pan with parchment paper, leaving an overhang for easy removal, and lightly grease it to prevent sticking.
  2. Combine Wet Ingredients: Melt 2/3 cup unsalted butter and allow it to cool slightly. In a large mixing bowl, whisk together the melted butter with 1 cup granulated sugar and 1/3 cup brown sugar until smooth. Beat in 2 cold eggs, one at a time, ensuring each is fully incorporated, then add 1 tsp pure vanilla extract and mix well.
  3. Mix Dry Ingredients: In a separate bowl, whisk together 2/3 cup sifted unsweetened cocoa powder, 1/2 cup all-purpose flour, and 1/2 tsp salt until evenly combined.
  4. Combine & Add Oreos: Gradually add the dry ingredients into the wet ingredients, mixing just until combined to avoid overmixing. Gently fold in the 15 coarsely crushed Oreo cookies, distributing them evenly throughout the batter.
  5. Bake Brownies: Pour the prepared batter evenly into the lined baking pan. Bake in the preheated oven for 25 to 30 minutes, or until a toothpick inserted into the center comes out with moist crumbs. Avoid overbaking to maintain fudginess. Cool the brownies completely on a wire rack, about 1 to 2 hours.
  6. Prepare Green Frosting: Beat 1 cup of softened unsalted butter until light and fluffy. Gradually add 4 cups sifted powdered sugar, 1/2 tsp pure vanilla extract, a pinch of salt, and 3 to 4 tablespoons of milk or heavy cream, beating until the frosting is smooth and spreadable. Mix in green gel food coloring until you achieve the desired spooky shade.
  7. Assemble & Decorate: Once the brownies are fully cooled, spread the green buttercream frosting evenly over the top. Arrange the remaining 5 Halloween-themed Oreo cookies on the frosted surface. Decorate with edible candy eyes and, if desired, add Halloween sprinkles or drizzle melted chocolate in spiderweb patterns for extra festive flair.
  8. Chill, Slice & Serve: Chill the decorated brownies in the refrigerator for at least 30 minutes to allow the frosting to set for clean slicing. Remove from fridge, slice using a hot, clean knife for neat edges, and serve. Store leftovers in an airtight container at room temperature for up to 3 days or refrigerated for up to one week.

Notes

  • Make sure not to overmix the batter to keep the brownies fudgy.
  • Cooling the brownies completely before frosting prevents melting and sliding of the frosting.
  • Using a hot knife to slice makes for cleaner edges on frosted brownies.
  • Store brownies in an airtight container to maintain freshness.
  • For a dairy-free version, substitute butter and milk with plant-based alternatives.

Keywords: Halloween brownies, Oreo brownies, holiday dessert, spooky treats, chocolate brownies, Halloween party food