This fudge brownie blondies recipe is the best of both worlds! Brownie blondie swirl bars made with white and semisweet chocolate chips, cocoa powder, and brown butter – all to make the best fudge blondie brownie recipe ever!
Preheat oven to 350°F. Line a 9x9 baking pan with parchment paper, leaving an overhang for easy removals of the brownie blondies.
In a large bowl, whisk together brown sugar, white sugar, and browned butter.
1 cup unsalted butter, ⅔ cup light brown sugar, ⅔ cup granulated sugar
Add in eggs and vanilla, and whisk well until mixture is thickened and lighter in color.
2 teaspoon pure vanilla extract, 3 large eggs
Sift in flour and salt, and fold in until just combined. Remove one-third of batter to a separate bowl.
1 cup all-purpose flour, 1 teaspoon salt
To your first bowl (the one with the larger amount of batter), add white chocolate chips and stir to combine.
½ cup white chocolate chips
To your second bowl, stir in cocoa powder and semisweet chocolate chips until well combined.
5 tablespoon unsweetened cocoa powder, ½ cup semi-sweet chocolate chips
Spread half of the white chocolate blondie batter evenly into the bottom of your prepared 9x9 pan. Top with the chocolate brownie batter; spread to even.
Add remaining white chocolate blondie batter in scattered spoonfuls on top; swirl with butter knife to create a marble effect.
Bake in preheated oven for 28-30 minutes, or until a toothpick entered into the center comes out clean, or with a few moist crumbs.
Let cool 15 minutes before enjoying warm, or transfer to a wire rack to cool completely.
Video
Notes
How to brown your butter:
Heat butter in a large light-colored sauté pan over medium high heat, stirring often.
Watch carefully as it begins to foam and the milk solids separate, and once the milk solids begin to turn a deep golden brown and the butter has a nutty aroma, remove from heat to a heat-safe container, scraping all the brown bits with it.
Add 2 tablespoons of water to replenish the water that evaporated while the butter was browning.
Let cool a bit to room temperature before adding it in to this recipe.