I created these brownies to be fun, festive, and irresistibly chocolatey — gooey chocolate brownies with a layer of Halloween-themed Oreos, topped with swirled orange frosting and crumbled cookies for extra crunch.

Oreo Layered Halloween Brownies

Why You’ll Love This Recipe

I love how this recipe looks as much as it tastes. The surprise Oreo layer inside gives an extra texture and flavor pop, and the bright orange frosting brings a playful Halloween twist. It doesn’t feel overly complicated, yet it makes a showstopping dessert that friends (especially kids) will adore.

Ingredients

(Here’s a tip: Check out the full list of ingredients and measurements in the recipe card below.)

Here’s the version I use (scaled for about 24 brownies):

1 box brownie mix
2 eggs
⅓ cup oil
⅓ cup milk
1 package Oreo cookies with orange filling
1 can milk chocolate frosting
1 can white or vanilla frosting
Orange food coloring gel

Directions

Here’s how I make these brownies step by step:

Preheat the oven to 350 °F (about 175 °C). Grease or line a 9×9 inch (or similar) baking pan with parchment paper.
In a mixing bowl, combine the brownie mix, eggs, oil, and milk. Mix until smooth and well combined.
Pour half of the brownie batter into the prepared baking pan, spreading it evenly.
Place the Oreo cookies (with orange filling) in a single layer over the batter.
Pour the remaining batter over the Oreos, covering them as best as possible.
Bake in the preheated oven for 25–30 minutes, or until a toothpick inserted in the center comes out with a few moist crumbs (I like them fudgy, so I don’t overbake).
Remove from oven and let cool completely in the pan.
While the brownies cool, in a bowl take the white (vanilla) frosting and mix in the orange filling from about 10 Oreos. Add orange food coloring gel if I want a brighter hue, mixing until smooth.
Once brownies are fully cooled, frost with the orange frosting.
Then top with the milk chocolate frosting and crumble the remaining Oreo cookies on top for decoration.
Slice into squares (for example 3×2 inch cuts) and serve.

Servings and timing

Servings: About 24 brownies (depending on cut size)
Prep time: ~10 minutes
Cook time: 25–30 minutes
Total time: ~35–40 minutes (plus cooling)

Variations

Here are some ways I sometimes tweak or customize this recipe:

If I want more cake-like texture, I add an extra egg (so use 3 eggs instead of 2).
I swap the seasonal Oreos for other flavors like mint, lemon, or even peanut butter for different occasions.
I drizzle white chocolate or dark chocolate over the top instead of—or in addition to—the crumbled Oreos.
I add a sprinkle of sea salt on top of the frosting for a sweet-savory contrast.
I use homemade brownie batter from scratch instead of a box mix if I have more time.

storage/reheating

I store leftovers in an airtight container at room temperature for up to 3 days.
If stored in the fridge, they keep about 4–5 days, but the texture firms up (I bring them to room temp before serving).
To warm a brownie, I microwave for 10–15 seconds so it’s slightly warm but not melted.
I avoid reheating in the oven, since the frosting may melt or brown too much.

FAQs

What kind of Oreo cookies should I use?

I like to use the Halloween Oreos with the orange filling, since they provide both the color and flavor contrast in the brownies. But I can use any Oreo variety depending on what I have or the occasion.

Can I make the brownies from scratch instead of using a box mix?

Yes — if I have my own favorite brownie recipe, I can use that. I just make sure the batter is thick enough to layer and cover the Oreos without spreading too much.

What if I don’t have two types of frosting?

If I only have one type of frosting, I just use that. I can tint part of a vanilla frosting with food coloring to make the orange layer, or keep it simple with one topping.

How do I keep the brownies fudgy and not dry?

I make sure not to overbake. I pull them from the oven when a toothpick comes out with a few moist crumbs. Letting them cool fully before frosting also helps retain moisture.

Can I freeze these brownies?

Yes — I wrap individual brownies in plastic wrap and place them in a freezer bag. They freeze well for up to 2–3 months. When ready to eat, I thaw them at room temperature or gently warm before serving.

Conclusion

I love making these Oreo Layered Halloween Brownies because they’re festive, simple, and always a hit. The fudgy chocolate base, Oreo crunch, and colorful frosting make them both delicious and fun to look at. They’ve become one of my go-to treats when I want to impress with minimal effort.