Name: Peanut Butter Swirl Brownies
Prep time: 10 min
Cook time: 30 min
Total time: 40 min
Cuisine: American
Ingredients: 1/2 cup unsalted butter, melted; 1 cup semi-sweet chocolate chips; 3/4 cup granulated sugar; 1/4 cup brown sugar; 2 large eggs; 1 teaspoon vanilla extract; 1/2 cup all-purpose flour; 1/4 cup unsweetened cocoa powder; 1/4 teaspoon salt; 1/2 cup creamy peanut butter; 2 tablespoons powdered sugar

Peanut Butter Swirl Brownies a rich, fudgy chocolate brownies layered with creamy peanut butter swirls create the ultimate sweet and salty dessert experience. I love how perfectly decadent and irresistibly gooey these brownies turn out in every bite. When I crave something deeply chocolatey with a nutty twist, this recipe always satisfies me.

Why You’ll Love This Recipe

I love how easy these brownies are to prepare with simple pantry staples. The combination of melted chocolate and cocoa powder gives me that deep, intense chocolate flavor I look for in a truly fudgy brownie. The creamy peanut butter swirls add a beautiful contrast in both flavor and texture.

I also appreciate how quickly everything comes together in one bowl with minimal cleanup. The swirl effect looks impressive, yet I only need a knife and a few gentle motions to create it. Every time I serve these, I enjoy how the sweet and salty balance keeps everyone coming back for another slice.

Ingredients

(Tip: You’ll find the full list of ingredients and measurements in the recipe card below.)

1/2 cup unsalted butter, melted
1 cup semi-sweet chocolate chips
3/4 cup granulated sugar
1/4 cup brown sugar
2 large eggs
1 teaspoon vanilla extract
1/2 cup all-purpose flour
1/4 cup unsweetened cocoa powder
1/4 teaspoon salt
1/2 cup creamy peanut butter
2 tablespoons powdered sugar

Directions

I start by preheating my oven to 350°F (175°C) and lining an 8×8-inch baking pan with parchment paper so the brownies lift out easily.

In a microwave-safe bowl, I melt the butter and chocolate chips together, stirring until the mixture is completely smooth and glossy. I whisk in the granulated sugar and brown sugar until everything is fully combined.

Next, I add the eggs and vanilla extract, mixing until the batter looks thick and shiny. I gently stir in the flour, cocoa powder, and salt just until combined, making sure not to overmix so the brownies stay tender and fudgy.

In a small bowl, I mix the peanut butter with powdered sugar until smooth and creamy. I pour the brownie batter into the prepared pan and spread it evenly. Then I drop spoonfuls of the peanut butter mixture over the top and use a knife to gently swirl it into the batter, creating a marbled effect.

I bake the brownies for 25 to 30 minutes, until the center is set but still slightly fudgy. I always let them cool completely before slicing to achieve clean, neat squares.

Servings and timing

Prep Time: 10 minutes

Cooking Time: 30 minutes

Total Time: 40 minutes

Servings: 9 servings

Calories: 320 kcal per serving

Variations

I sometimes add a handful of chopped roasted peanuts for extra crunch. When I want an even richer flavor, I swap semi-sweet chocolate chips for dark chocolate chips. If I feel like experimenting, I drizzle melted chocolate over the cooled brownies for a more indulgent finish. I also enjoy adding a pinch of flaky sea salt on top to enhance the sweet and salty contrast.

Storage/Reheating

I store the brownies in an airtight container at room temperature for up to 3 days. If I want them to last longer, I refrigerate them for up to a week, making sure they are tightly covered to prevent drying out.

For reheating, I warm a slice in the microwave for about 10–15 seconds to bring back that gooey, just-baked texture. If I freeze them, I wrap individual squares in plastic wrap and store them in a freezer-safe container for up to 2 months. I let them thaw at room temperature before serving.

Related Recipes:

Chocolate Swirled Pumpkin Cheesecake Bars

FAQs

How do I know when the brownies are done?

I check the center with a toothpick. I look for a few moist crumbs rather than wet batter. I avoid overbaking because I prefer a fudgy texture.

Can I use natural peanut butter?

I can use natural peanut butter, but I make sure it is well stirred. I find that conventional creamy peanut butter gives a smoother swirl and more consistent texture.

Can I double the recipe?

I double the ingredients and bake the batter in a 9×13-inch pan. I may need to adjust the baking time slightly and keep an eye on the center for doneness.

How do I make the brownies extra fudgy?

I slightly underbake them and let them finish setting as they cool. I also avoid overmixing the flour to keep the texture dense and moist.

Can I add other mix-ins?

I like adding chocolate chunks, peanut butter chips, or even a swirl of caramel. I fold them in gently before baking to keep the batter light.

Conclusion

I always turn to these peanut butter swirl brownies when I want a dessert that feels indulgent yet simple to prepare. The rich chocolate base combined with creamy peanut butter swirls creates a perfectly balanced treat that I genuinely enjoy making and sharing. Every batch reminds me how a few basic ingredients can transform into something truly irresistible.

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