Fudgy Peanut Butter Swirl Brownies

4.26 from 27 votes

Rich and fudgy brownies with a peanut butter swirl! These are some serious brownies!

Prep Time30

Cook Time30

Total Time1

Course: Dessert

Cuisine: American

Servings: brownies

Calories: 304kcal

Cost: $5

2 ounces (57g) unsweetened baking chocolate coarsely chopped
2 ounces (57g) semi-sweet baking chocolate coarsely chopped
¾ cup (170g) unsalted butter
1 ¾ cups (450g) granulated sugar
½ teaspoon salt
3 large eggs
1 teaspoon vanilla extract
2 tablespoons (10g) unsweetened cocoa powder I love using Hershey’s Dark, but you can use either regular or dark
1 cup (124g) all-purpose flour

Preheat oven to 350F. Line a 9x9” pan with foil and spray with cooking spray.
Place the two baking chocolates and butter in a large, microwave safe bowl. Heat on HIGH power for 2-3 minutes, stirring every 30 seconds, until chocolate is smooth. Stir in sugar. Add eggs, vanilla, and cocoa and stir well. Add flour and stir carefully. Spread batter in prepared pan.
Stir together peanut butter, melted butter, powdered sugar, and vanilla. Drop spoonfuls on top of the brownies then swirl with a butter knife or the back of a wooden spoon.
Bake about 28-30 minutes, until the center seems set. Let cool before cutting. These brownies, baked this way, will be super gooey inside. If you like your brownies more done and less gooey, bake them longer.

You can reduce the sugar in the recipe to 1 1/4 cups - that's as low as I've gone when testing.
Feel free to use 4 ounces unsweetened baking chocolate. If using 4 ounces semi-sweet baking chocolate, reduce sugar to 1 1/2 cups.