Triple Layer Fudgy Mint Oreo Brownies are a chocolate lover’s dream come true, packed with rich, fudgy brownie layers, a refreshing mint twist, and crunchy Oreo pieces throughout. Each bite delivers a perfect balance of smooth chocolate, cool mint, and a satisfying Oreo crunch that keeps you coming back for more.
I love making these brownies when I want to treat myself or impress guests because they feel special but are surprisingly simple to make. The trio of textures and flavors—gooey, minty, and crunchy—always gets lots of compliments, and I find that letting them cool a bit before cutting really helps keep the layers distinct and the edges clean.
My favorite way to enjoy these brownies is with a cold glass of milk or a hot cup of coffee. They’re perfect for sharing at parties, but honestly, sometimes I keep them all to myself. Make sure to store them in an airtight container so they stay fudgy and fresh for several days, although they rarely last that long at my house!
Key Ingredients & Substitutions
Unsalted Butter: Butter adds richness and a fudgy texture. You can swap it for coconut oil if you want a dairy-free option, but the flavor will change slightly.
Cocoa Powder: Use unsweetened for deep chocolate flavor. Dutch-processed works best for a smooth taste, but natural cocoa is fine too.
Oreo Cookies: Classic Oreos give the perfect crunch. For variety, try chocolate sandwich cookies or mint-flavored Oreos for extra mintiness.
Mint Chocolate Chips / Andes Mints: These give the refreshing mint layer. If you can’t find them, chopped mint-flavored white chocolate or a few drops of peppermint extract in the white chocolate can work.
Fresh Mint Leaves: Optional but adds a nice fresh touch. If you don’t have fresh leaves, omit them or add a bit of mint extract in the mint layer instead.
How Do You Get Perfect Fudgy Brownie Layers Without Overbaking?
Fudgy brownies need the right balance of moisture and don’t like too much baking time. Follow these tips for success:
- Watch the baking time closely—start checking at 35 minutes. The toothpick should come out with a few moist crumbs, not clean.
- Use an oven thermometer if you can to make sure your oven is accurate.
- Let brownies cool completely before slicing. This helps the layers set and keeps edges from crumbling.
- Spread the batter gently over the mint layer to avoid mixing layers.
- Use room temperature eggs and melted butter for smooth batter and even baking.
Equipment You’ll Need
- 9×13 inch baking pan – I use this size because it’s perfect for even baking and easy to cut into neat squares.
- Parchment paper or non-stick spray – helps prevent sticking and makes removing the brownies easier.
- Medium saucepan – for melting butter and white chocolate chips smoothly.
- Mixing bowls – for mixing the brownie batter and melting chocolates separately.
- Spatula or spoon – to spread the batter evenly and layer the ingredients carefully.
- Microwave-safe bowl – for melting the mint chocolate chips or Andes mints.
Flavor Variations & Add-Ins
- Swap mint chocolate chips with peanut butter chips or caramel bits for a different flavor twist.
- Use dark chocolate or semisweet chocolate chips instead of white for a richer, less sweet mint layer.
- Add chopped nuts like pecans or walnuts for extra crunch and texture.
- Mix in a teaspoon of peppermint extract in the batter for a more intense mint flavor without adding fresh mint leaves.
Triple Layer Fudgy Mint Oreo Brownies
Ingredients You’ll Need:
- 1 cup (226g) unsalted butter
- 2 cups (400g) granulated sugar
- 4 large eggs
- 1 tablespoon vanilla extract
- 1 cup (85g) unsweetened cocoa powder
- 1 cup (125g) all-purpose flour
- ½ teaspoon salt
- ½ teaspoon baking powder
- 20 Oreo cookies (classic black), divided
- 1 cup (225g) white chocolate chips
- ½ cup (115g) mint chocolate chips or chopped Andes mints
- Fresh mint leaves (8-10 leaves, optional, for extra mint flavor and decoration)
- Green food coloring (optional, for a vibrant mint layer)
How Much Time Will You Need?
This recipe takes about 15 minutes to prepare and around 35-40 minutes to bake. Allow extra time for the brownies to cool completely, which helps the layers set perfectly—usually about 1 hour. Altogether, plan for about 1 hour and 45 minutes from start to finish.
Step-by-Step Instructions:
1. Get Your Oven and Pan Ready
Preheat your oven to 350°F (175°C). Line a 9×13 inch baking pan with parchment paper or grease it well to keep your brownies from sticking.
2. Make the Brownie Batter
Melt the butter over medium heat in a saucepan. Remove from heat, then stir in the sugar, eggs, and vanilla extract until the mixture is smooth and shiny. In a separate bowl, sift together the cocoa powder, flour, salt, and baking powder. Gradually mix the dry ingredients into the wet mix, stirring just until combined—don’t overmix.
3. Layer the Brownie Base and Oreos
Pour half of your brownie batter into the prepared pan and spread it evenly. Place half of the Oreo cookies in a single layer on top.
4. Prepare the Mint Chocolate Layer
In a microwave-safe bowl, melt the white chocolate chips and mint chocolate chips (or chopped Andes mints) in 30-second intervals, stirring between each until smooth. Add a few drops of green food coloring if you want a bright mint look. Optionally, stir in finely chopped fresh mint leaves for extra mint flavor.
5. Add the Mint Layer and Top Brownie Batter
Spread the melted mint chocolate mixture evenly over the Oreo layer. Gently spoon the remaining brownie batter on top, spreading it carefully so you don’t mix the layers.
6. Garnish and Bake
Press the remaining Oreo cookies evenly on top for decoration. Bake the brownies for 35-40 minutes, or until a toothpick inserted near the center comes out with some moist crumbs (avoid overbaking to keep them fudgy).
7. Cool and Serve
Let the brownies cool completely in the pan. This helps the layers firm up and makes cutting clean squares easier. Once cooled, slice up and enjoy the delicious fudgy brownies with mint and Oreo goodness!
Can I Use Frozen Butter for This Recipe?
It’s best to use room temperature or melted butter as called for in the recipe. If using frozen butter, thaw it completely and melt it before mixing to ensure a smooth batter.
Can I Substitute Mint Chocolate Chips?
Yes! You can use chopped Andes mints, peppermint extract added to white chocolate, or even regular white chocolate with a little green food coloring for the mint layer.
How Should I Store These Brownies?
Store brownies in an airtight container at room temperature for up to 3 days. For longer storage, wrap tightly and freeze for up to 2 months. Thaw at room temperature before serving.
Can I Make These Brownies Ahead of Time?
Absolutely! Bake and cool the brownies, then cover and store. They’re even better the next day after flavors meld. Just slice before serving or store whole and cut later.