Ready in: 1 hour · Serves: 16 · Technique: Baking · Storage: Airtight container for up to 4 days.
Quick Answer
The perfect way to indulge during the holidays, these Oreo Reese’s fudge brownies are a delightful treat that combines the richness of chocolate with the crunch of cookies.
As the holiday season approaches here in New York City, my kitchen becomes a haven filled with the warm, inviting scents of baking. With Thanksgiving and Christmas just around the corner, there’s nothing quite like indulging in a rich dessert to share with family and friends. Enter these decadent Oreo Reese’s fudge brownies—a delightful twist on traditional brownies that combines everyone’s favorite cookies and chocolate candy. Trust me; these brownies are not only a feast for the eyes but also a burst of flavor that will leave your loved ones asking for seconds.
A Decadent Holiday Treat

Why You’ll Love This Recipe
- Indulge in a rich and fudgy brownie experience enhanced by Oreo and Reese’s flavors.
- Impress your family and friends with an eye-catching dessert that’s easy to make.
- Perfect for holiday gatherings or cozy nights in, providing a delightful treat for all.
- Simple ingredients create an unforgettable flavor and texture without the fuss.
Ingredients
Gather the following high-quality ingredients to make these delectable brownies:
For the Brownies
- 1 cup unsalted butter (two sticks)
- 2 cups granulated sugar
- 4 large eggs
- 1 teaspoon vanilla extract
- 1 cup all-purpose flour
- 1 cup unsweetened cocoa powder (preferably Dutch-process)
- 1 teaspoon baking powder
- 1/2 teaspoon salt
- 8 Oreo cookies, coarsely chopped
- 1/2 cup Reese’s Peanut Butter Cups, chopped into small pieces
- 1 cup semi-sweet chocolate chips
How to Make Oreo Reese’s Fudge Brownies (Step-by-Step)
Follow these simple steps to create your perfect batch of Oreo Reese’s fudge brownies:
Step 1: Preheat the Oven
Start by preheating your oven to 350°F (175°C). Accuracy is key for baking success.
Step 2: Prepare the Pan
Line a 9×13-inch baking dish with parchment paper for easy removal later. Grease it lightly to help the paper stick.
Step 3: Melt the Butter
In a medium saucepan over low heat, melt the butter until fully liquefied. The melting butter aroma signals something delicious is coming.
Step 4: Mix the Wet Ingredients
Remove the melted butter from heat and whisk in the sugar until glossy. Add the eggs one at a time, then stir in the vanilla extract until fully combined.
Step 5: Combine the Dry Ingredients
In a separate bowl, whisk together the flour, cocoa powder, baking powder, and salt. Gently fold this dry mixture into the wet ingredients until just combined.
Step 6: Add Chocolates and Cookies
Gently fold in the chocolate chips, chopped Oreo cookies, and Reese’s Peanut Butter Cups for a burst of flavor in every bite.
Step 7: Bake
Pour the batter into your prepared dish, spreading evenly. Bake for 25-30 minutes or until a toothpick comes out with a few moist crumbs.
Step 8: Cool and Slice
Let the brownies cool in the pan for 10 minutes before using the parchment paper to lift them out. Allow them to cool completely on a wire rack before slicing into squares.

Common Mistakes to Avoid
- Overmixing: This can lead to tough brownies. Mix until just combined!
- Using Old Ingredients: Ensure your baking powder and cocoa powder are fresh for the best rise and flavor.
- Cutting Too Soon: Let the brownies cool fully before slicing, as this helps them set and makes cutting easier.
Tips and Tricks for Success
- For Extra Indulgence: Drizzle melted chocolate or caramel over the top before slicing.
- Storing: These brownies can be stored in an airtight container at room temperature for up to 4 days—or you can freeze them for longer storage. Just wrap them tightly to prevent freezer burn.
- Flavor Variations: Try adding chopped nuts or using different types of chocolate chips for varied flavors!
Variations
- Substitute Oreo cookies with other sandwich cookies like Golden Oreos or Mega Stuf.
- Use milk chocolate chips instead of semi-sweet for a sweeter taste.
- Add chopped walnuts or pecans for a nutty crunch.
- Incorporate flavored chocolate (e.g., white chocolate or dark chocolate) for a different twist.
How to Serve
- Serve warm with a scoop of vanilla ice cream on top.
- Plate with a drizzle of chocolate sauce or caramel for added decadence.
- Dust with powdered sugar for a simple but elegant presentation.
- Pair with a glass of cold milk or a hot cup of coffee for a delightful treat.

Make Ahead and Storage
- Make Ahead: Prepare the batter up to a day in advance and store in the refrigerator.
- Storage: Store these brownies in an airtight container at room temperature for up to four days.
- Reheating: Warm in the microwave for 10-15 seconds if desired.
- Freezing: Wrap tightly in plastic wrap and then in foil to preserve freshness for longer storage.
Recipe Notes / What I Learned
When testing these brownie delights, I discovered that sometimes simple ingredients can come together to create an unforgettable experience. The combination of cookies and candy not only gives these brownies a wonderful texture but also elevates the chocolatey flavor to new heights—truly a holiday treat to remember!
Yield and Serving Size
Yield: 24 brownies · Serving Size: 1 brownie
Nutrition Snapshot
Estimated Nutrition Per Serving: ~320 calories · 5g protein · 40g carbs · 16g fat

Indulgent Oreo Reese’s Fudge Brownies
Ingredients
Equipment
Method
- Preheat your oven to 350°F (175°C).
- Line a 9×13-inch baking dish with parchment paper and grease lightly.
- Melt the butter in a medium saucepan over low heat.
- Remove the melted butter from heat, whisk in the sugar until glossy, then add the eggs one at a time, followed by the vanilla extract.
- In a separate bowl, whisk together the flour, cocoa powder, baking powder, and salt. Gently fold this dry mixture into the wet ingredients until just combined.
- Fold in the chocolate chips, chopped Oreo cookies, and Reese’s Peanut Butter Cups.
- Pour the batter into the prepared dish and bake for 25-30 minutes or until a toothpick comes out with a few moist crumbs.
- Cool in the pan for 10 minutes before lifting out using the parchment paper. Let cool completely on a wire rack and slice into squares.
Notes
FAQs
1. Can I use salted butter instead of unsalted?
Yes, you can use salted butter, but it may alter the overall flavor slightly. If you do, consider omitting the additional salt in the recipe.
2. How can I make these brownies gluten-free?
You can substitute all-purpose flour with a gluten-free flour blend, making sure to check if it contains a leavening agent for best results.
3. What should I do if my brownies are too dry?
If your brownies turn out dry, it’s likely they were overbaked. Make sure to check them a few minutes before the suggested baking time.
4. Can I add nuts to the brownie batter?
Absolutely! Chopped walnuts or pecans can add a wonderful crunch and complement the flavors nicely. Just fold them in with the chocolate and cookies.
5. How do I know when the brownies are done?
Insert a toothpick into the center; it should come out with a few moist crumbs attached. If it comes out clean, they may be overbaked.







