Description

These Halloween Oreo Brownies are a festive twist on classic fudgy brownies, loaded with coarsely crushed Oreo cookies and topped with vibrant green buttercream frosting. Finished with Halloween-themed Oreos, candy eyes, sprinkles, and optional chocolate drizzles, these brownies are perfect for spooky celebrations and make a delightful treat for all ages.

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

Frosting

1 cup unsalted butter, softened
4 cups powdered sugar, sifted
1/2 tsp pure vanilla extract
3–4 tbsp milk or heavy cream
Green gel food coloring
Pinch of salt

Decorations

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

Instructions

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.
Combine Wet Ingredients: Melt 2/3 cup of unsalted butter and allow it to cool slightly. In a large mixing bowl, whisk together the melted butter, granulated sugar, and brown sugar until smooth. Beat in the two cold eggs one at a time, followed by the vanilla extract, ensuring a well-incorporated mixture.
Mix Dry Ingredients: In a separate bowl, sift and whisk together the cocoa powder, all-purpose flour, and salt to combine evenly.
Combine & Add Oreos: Gradually add the dry ingredients into the wet ingredients, mixing until just combined to avoid overmixing. Gently fold in the coarsely crushed Oreo cookies, distributing them throughout the batter.
Bake Brownies: Pour the batter evenly into the prepared baking pan. Bake in the preheated oven for 25-30 minutes, or until a toothpick inserted into the center comes out with moist crumbs. Avoid overbaking to maintain fudgy texture. Once done, cool completely on a wire rack for 1-2 hours.
Prepare Green Frosting: For the frosting, beat the softened unsalted butter until light and fluffy. Gradually add the sifted powdered sugar, vanilla extract, a pinch of salt, and 3 to 4 tablespoons of milk or heavy cream. Beat the frosting until smooth and spreadable. Add green gel food coloring to achieve a spooky Halloween green hue.
Assemble & Decorate: Make sure the brownies are fully cooled before spreading the green buttercream evenly over the surface. Arrange the five Halloween-themed Oreo cookies on top, then decorate with edible candy eyes and, if desired, Halloween-themed sprinkles or drizzles of melted white or dark chocolate to create fun designs like spiderwebs.
Chill, Slice & Serve: Chill the decorated brownies in the refrigerator for at least 30 minutes to set the frosting and enable clean slicing. Remove from fridge, slice using a hot, clean knife, and serve. Store any leftovers in an airtight container at room temperature for up to 3 days or refrigerated for up to one week.

Notes

Ensure eggs are cold to help achieve a fudgy texture in the brownies.
Do not overmix the batter after combining dry and wet ingredients to avoid tough brownies.
The green frosting can be adjusted in color intensity depending on the amount of gel food coloring added.
Using parchment paper with an overhang allows easy removal of the entire brownie slab.
For cleaner slices, wipe the knife clean and warm it between cuts.
Optional melted chocolate decorations can be piped or drizzled for an extra spooky detail.
Store brownies properly to maintain freshness and prevent drying out.

Prep Time: 15 minutes
Cook Time: 25-30 minutes
Category: Dessert
Method: Baking
Cuisine: American

Keywords: Halloween brownies, Oreo brownies, fudgy brownies, Halloween dessert, festive brownies, chocolate brownies