Peanut Butter Swirl Brownies

Name: Peanut Butter Swirl Brownies
Prep time: 15 min
Cook time: 30 min
Total time: 45 min
Ingredients: 6 ounces semisweet chocolate (chopped); 2 ounces unsweetened chocolate (chopped); 8 Tablespoons butter (cut into 8 pieces); ¼ cup cocoa powder; 3 large eggs (at room temperature); 1 ¼ cup granulated sugar; 2 teaspoons pure vanilla extract; ½ teaspoon salt; 1 cup all-purpose flour; ½ teaspoon baking powder; ⅓ cup smooth peanut butter (I used Jif Peanut Butter)

The recipe prices will vary based on fluctuating grocery costs. Please use what is posted as a guide.

Recipe Cost $8.93

Recipe Serving Cost $0.55

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These Peanut Butter Swirl Brownies are just the thing when you’re craving chocolate and peanut butter. They’re rich and fudgy and have just the right amount of peanut butter!

It costs approximately $8.93 to make these brownies. The recipe makes sixteen servings for about $0.55 per serving.

In addition to these Peanut Butter Swirl Brownies, I also love these Chocolate PeanutButter Cupcakes, No-Bake Chocolate Peanut Butter Bars, Chocolate Peanut Butter Macarons, and these Peanut Butter Chocolate Chip Cookies.

Who wants to eat a boring ol’ plain brownie when you can make them into mega delicious Peanut Butter Swirl Brownies?!

This is an excellent ol’ recipe classic to have in your repertoire. They’re easy to make, and take just one bowl to whip everything together! My 8-year-old loves making this brownie recipe with me on the regular!

These homemade, double chocolate fudgy brownies become even more irresistible after the smooth peanut butter swirl is added in. They become the ultimate dessert, perfect for family game nights, potlucks, work parties, summer swim parties, you name it!

These brownies are fabulous for any occasion. The hardest part is waiting for them to cool before being able to inhale them.

The finished Swirl Peanut Butter Brownies on a white platter.

Ingredients and Estimated Cost

Per Serving Cost: $0.55

Recipe Cost: $8.93

6 ounces semisweet chocolate – $3.72
2 ounces unsweetened chocolate – $1.24
8 Tablespoons butter – $0.88
¼ cup cocoa powder – $0.38
3 large eggs – $0.69
1 ¼ cups granulated sugar – $0.21
2 teaspoons pure vanilla extract – $1.36
½ teaspoon salt – $0.01
1 cup all-purpose flour – $0.19
½ teaspoon baking powder – $0.02
⅓ cup smooth peanut butter – $0.23

NOTE: The recipe prices are calculated by using grocery store websites. The actual cost of the recipe will vary depending on what ingredients you already have.

How To Make Peanut Swirl Brownies

First, preheat the oven to 350 degrees F. Spray a 9×13-inch baking pan with nonstick cooking spray, line it with foil, and then spray the foil.
Using a large microwave-safe bowl, add the chopped chocolate and butter and microwave it for one minute. Stir the mixture and microwave again for thirty seconds. Continue this process until the mixture is smooth.
Whisk in the cocoa powdered and set aside to cool.
Then, whisk together the eggs, sugar, vanilla, and salt into the chocolate mixture until combined.
Next, mix in the flour and baking powder using a wooden spoon.
Evenly pour and spread the batter into the baking dish.
Then place dollops of peanut butter on top of the brownie batter.
Use a butter knife to create swirls by running the butter knife through the batter.
To finish, bake the brownies for about twenty-five to thirty minutes. Place the brownies on a wire rack to cool for about two hours.

***For complete recipe instructions, see the recipe card below.

Recipe Variations

To make this brownie recipe super decadent, serve them with a thin layer of my Peanut Butter Buttercream spread over the top!

Serving and Storage Tips

SERVE: Serve the brownies on their own or with some Vanilla Frozen Custard Ice Cream or Loaded No-Churn Peanut Butter Ice Cream.

STORE: Leftover brownies can be kept in an air-tight container in the refrigerator for up to 5 days.

FREEZE: The Peanut Butter Swirl Brownies will keep in an airtight container or Ziploc bag in the freezer for up to 2 months.

Recipe FAQs

What makes brownies fudgy vs cakey?

Fudge-like brownies have a higher fat-to-flour ratio than cake-like brownies do. Adding more chocolate and butter makes brownies have that hard-to-resist fudge-like texture. If brownies are more cake-like in texture, they will have more flour and baking powder on the ingredient list.

Why do my brownies get hard around the edges?

This typically happens as a result of overcooking the brownies. Each oven is different in how it operates and functions. Each recipe should be used as a guide when cooking anything. While my recipe states to cook the brownies for twenty-five to thirty minutes, it is always a good idea to check on them before that time in case your oven temperature is different or it cooks fast than my oven.

Do you bake brownies on the top or bottom rack?

I recommend you bake your brownies on the middle rack of the oven. This is where the air circulates the best, and the heat sources are evenly distributed, getting you that perfectly cooked brownie we are striving for that doesn’t burn or brown too quickly as it may on the top or bottom racks.

An overhead picture of the finished Peanut Butter Swirl Brownies on a wire rack.

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