BYU Chocolate Mint Brownies Recipe: Peppermint Swirls and Crispy Edges

This BYU Chocolate Mint Brownies recipe delivers the iconic fudgy texture and peppermint swirls that make them legendary. 💛 The secret lies in balancing rich cocoa with just the right amount of mint extract—no artificial aftertaste here.

I’ve perfected the ratio over years of baking, ensuring crispy edges that contrast beautifully with the tender center.

What sets these brownies apart is the technique: folding mint buttercream into the warm batter creates those signature swirls while keeping the texture perfectly moist.

The recipe uses high-quality cocoa powder and a precise oven temperature to guarantee that signature crispy crust without burning the edges—a common pitfall in home baking.

By the time you pull them from the oven, you’ll have a pan of brownies with deep chocolate flavor and refreshing mint undertones, topped with glossy swirls that make them look as good as they taste.

The combination of rich cocoa and cooling mint creates a flavor profile that’s both nostalgic and irresistibly indulgent.

These brownies are perfect for holiday gatherings, BYU football game parties, or whenever you want to bring a taste of Provo to your kitchen. The recipe scales easily, so you can bake a single pan for a small crowd or double it for larger groups. Let’s get baking!

Ingredients for byu chocolate mint brownies

These iconic brownies need just 14 ingredients for that perfect BYU chocolate-mint magic.

The cocoa powder makes all the difference—Dutch-processed keeps the flavor rich and smooth. Guittard or Valrhona are my go-tos, but any high-quality brand works. Peppermint extract is key here: Gourmet strength gives that authentic BYU flavor without being overpowering. I grab mine from Williams Sonoma or Amazon—just make sure it's pure, not imitation. For the chocolate chips, Guittard mint chips are the gold standard, though Hershey's Special Dark with added mint extract works too. And don't skip sifting the flour—it makes those crispy edges happen.

No peppermint extract? Crushed candy canes at half the amount works in a pinch (though it adds moisture). Want to cut sugar? Substitute half with monk fruit sweetener, but taste first—the flavor profile changes. For the buttercream, if you're dairy-free, vegan butter and coconut milk work beautifully. The eggs? Room temperature mix better, but cold ones work if you're in a hurry. And if you're scaling this up, double the buttercream—trust me, you'll want extra for decorating.

Brownies keep best at room temperature in an airtight container for 3-4 days. For longer storage, wrap tightly in foil and freeze for up to 3 months. The buttercream? Store it separately in the fridge and whip back up before serving. Pro tip: Make the batter a day ahead—the flavors meld beautifully overnight. And if you're serving at a BYU game, cut into squares for easy grabbing (just don't tell anyone I said that).

Step-by-step instructions for BYU chocolate mint brownies

Here's how to bake fudgy brownies with peppermint swirls and crispy edges that'll impress everyone.

In a large mixing bowl, combine the 1 cup unsalted butter and 2 cups granulated sugar. Using an electric mixer on medium speed, beat for 3-4 minutes until the mixture becomes light and fluffy. You'll notice the color change from pale yellow to a lighter shade—this is when air gets incorporated, creating that perfect fudgy texture.

Here's the thing—I like to scrape down the sides of the bowl every 30 seconds to ensure everything gets evenly mixed. The butter should be completely smooth with no lumps. If you're using room-temperature butter, this process will be easier, but if it's too soft, chill the bowl for 10 minutes before continuing. This step sets the foundation for rich, moist brownies.

Add the 2 whole large eggs, 1 tbsp pure peppermint extract, and 1 tsp vanilla extract to the butter-sugar mixture. Beat on medium speed for 1-2 minutes until fully combined. The mixture will look slightly thicker, and you'll start to smell that fresh peppermint aroma—this is where the magic begins!

I always add the extracts last because they're potent. A little goes a long way, and you don't want to overpower the chocolate flavor. The eggs help bind everything together, so make sure they're at room temperature. If they're cold, warm them slightly in warm water for 5 minutes before adding. This ensures even mixing and prevents dense brownies.

In a separate bowl, whisk together the 1.5 cups all-purpose flour, 0.75 cup unsweetened cocoa powder, 0.5 tsp baking powder, and 0.25 tsp salt. Sift the dry ingredients directly into the wet mixture to avoid lumps. Using a spatula, gently fold everything together just until combined—you should still see some flour streaks. Overmixing develops gluten, which can make your brownies tough instead of fudgy.

Now, fold in the 1.5 cups mint chocolate chips using a rubber spatula. Be gentle to keep the chocolate chips evenly distributed throughout the batter. Don't worry if the batter looks thick—it's supposed to be this way. The chocolate chips will melt slightly during baking, creating pockets of gooey goodness. This is the moment that matters: make sure every spoonful of batter has chocolate chips in it.

Preheat your oven to 350°F. Line an 8x8-inch baking pan with parchment paper, leaving an overhang on the sides for easy removal. Spread the brownie batter evenly into the pan, using the back of a spoon to smooth the top. Tap the pan gently on the counter a few times to release any air bubbles—this ensures even baking.

Bake for 25-30 minutes until a toothpick inserted in the center comes out with a few moist crumbs (not wet batter). The edges should be deep golden brown, and you'll see the top starting to crack slightly—that's your crispy edge signal. If your oven runs hot, start checking at the 20-minute mark. Don't overbake, or the brownies will turn dry and lose their fudgy texture.

While the brownies bake, make the buttercream by beating the 0.5 cup cold unsalted butter until creamy. Gradually add the 1 cup powdered sugar, 0.5 tsp pure peppermint extract, and 1 tbsp milk, mixing on medium speed until smooth and fluffy. This should take about 2-3 minutes. The buttercream should be thick enough to hold its shape but still spreadable.

Once the brownies are baked and slightly cooled (but still warm), spread the peppermint buttercream evenly over the top. Use a spatula to create swirls by dragging it through the buttercream in a circular motion. For extra flair, sprinkle additional mint chocolate chips on top. Let the brownies cool completely in the pan before slicing into 16 perfect squares. The contrast of warm, fudgy brownies with cool, minty buttercream is what makes these brownies unforgettable!

Flavor customization for these flavors

Mint Intensity Control

Adjust the peppermint flavor to your taste by modifying the extract amounts. For a subtle mint kick, use ½ tsp peppermint extract in the batter and ¼ tsp in the buttercream.

If you love bold flavors, try 1.5 tbsp extract in the batter and ¾ tsp in the buttercream. Remember, extracts concentrate over time—start with less if you're unsure. 🌿

Chocolate Variations

Swap the unsweetened cocoa powder for dark chocolate by melting 4 oz of 70% dark chocolate with the butter. This adds richness while keeping the same fudgy texture. For a white chocolate twist, replace half the cocoa with white chocolate chips and reduce the sugar to 1.5 cups.

The contrast of white chocolate with mint is surprisingly delicious!

Nutty Additions

Fold in ½ cup chopped walnuts or pecans for crunch, toasting them first in a dry pan for 3-4 minutes until fragrant. For a hazelnut variation, replace the nuts with 1 cup Nutella mixed into the batter—just reduce the sugar to 1.5 cups to balance the sweetness.

These additions add texture and depth to the classic recipe. 💡

Dairy-Free Adaptations

Use vegan butter and coconut milk instead of regular milk in the buttercream. For the batter, replace the eggs with 2 flax eggs (2 tbsp ground flaxseed + 6 tbsp water, mixed and rested for 5 minutes).

The texture stays fudgy, though slightly denser. Dairy-free chocolate chips work too—just check for mint-infused options like Enjoy Life brand.

Sweetness Adjustments

Reduce sugar by ¼ cup and add 2 tbsp maple syrup or monk fruit sweetener for a less sweet version. For extra richness, replace ½ cup sugar with ½ cup brown sugar—it adds a caramel note that pairs beautifully with mint.

Taste the batter before baking; adjust as needed. The buttercream can also be sweetened with 1-2 extra tbsp powdered sugar if preferred. 🍯

Decorative Touches

Pipe the buttercream in roses or swirls with a star tip for a bakery-style finish. Add crushed candy canes on top for a festive look, or dust with powdered sugar for an elegant touch.

For a glossy finish, brush the cooled brownies with simple syrup (equal parts sugar and water, heated until dissolved). These details elevate the presentation without changing the flavor. ✨

Frequently asked questions