Brown Butter White Chocolate Blondies with Blueberry Swirl
Brown Butter White Chocolate Blondies with Blueberry Swirl are rich, chewy dessert bars made with nutty browned butter, creamy white chocolate chips, and a thick homemade blueberry compote swirled across the top. This beginner friendly blondie recipe explains exactly how to brown butter, thicken compote, swirl without overmixing, and bake to the perfect soft center so your blondies turn out flavorful and balanced every time.
Equipment
- 8 x 8 inch baking pan
- Cooling rack
Ingredients
Blueberry Compote
- 2 cups blueberries fresh or frozen
- 1/4 cup granulated sugar
- 1 tbsp lemon juice
- 1 tsp cornstarch
- 1 tbsp water
Blondies
- 1 cup unsalted butter
- 1 cup light brown sugar packed
- 1/2 cup granulated sugar
- 2 large eggs room temperature
- 2 tsp vanilla extract
- 1 3/4 cups all purpose flour
- 1/2 tsp fine salt
- 3/4 cup white chocolate chips
Optional Finish
- Flakey sea salt
Instructions
Make the Blueberry Compote
- Add the blueberries, sugar, and lemon juice to a small saucepan, then place it over medium heat. Stir occasionally as the berries warm up so the sugar dissolves and nothing sticks to the bottom.
- Once the berries start to bubble and soften, use the back of a spoon to gently press a few of them against the side of the pan. This helps release juices and creates a thicker, jam-like texture.
- In a small bowl, stir together the cornstarch and water until smooth. This mixture is called a slurry and it helps thicken the compote evenly without lumps.
- While the compote is bubbling gently, pour in the cornstarch slurry and stir right away. Keep cooking for 2 to 4 minutes, stirring often, until the compote thickens. You will know it is ready when it coats the back of a spoon and falls off slowly instead of running like syrup.
- Remove the saucepan from the heat and transfer the compote to a bowl so it can cool faster. Let it cool completely before swirling it onto the blondie batter. If you add it while warm, it can sink into the batter and you will lose the swirl.
Prepare the Oven and Pan
- Preheat your oven to 350 degrees Fahrenheit.
- Line an 8 by 8 inch baking pan with parchment paper, leaving extra paper hanging over two sides. This overhang acts like handles so you can lift the blondies out after they cool, which makes slicing much easier and cleaner.
Brown the Butter
- Add the butter to a medium saucepan and place it over medium heat. Let it melt completely.
- Keep cooking the butter, stirring frequently. It will foam and then the foam will begin to settle. This is normal.
- Watch for small brown specks forming at the bottom of the pan and a nutty smell. Once the butter turns a deep golden color and smells toasty, remove it from the heat immediately. Browned butter can burn quickly if left on the heat too long.
- Pour the browned butter into a heatproof mixing bowl, making sure to scrape in the brown specks because they hold a lot of the flavor. Let the butter cool for 10 to 15 minutes so it is warm but not hot.
Mix the Batter
- Add the brown sugar and granulated sugar to the slightly cooled browned butter. Whisk until the mixture looks smooth and glossy.
- Add the eggs one at a time, whisking well after each. This helps the batter come together smoothly and gives the blondies structure as they bake.
- Stir in the vanilla extract until evenly mixed.
- Add the flour and salt. Switch to a rubber spatula and gently fold the dry ingredients in just until you no longer see streaks of flour. Stop mixing as soon as everything is combined. This is what keeps the blondies chewy instead of cakey.
- Fold in the white chocolate chips until they are evenly distributed throughout the batter.
Assemble and Swirl
- Spoon the batter into the prepared pan and spread it evenly into the corners. Smooth the top so it bakes level.
- Spoon small dollops of cooled, thick blueberry compote across the surface of the batter. Try to space them out so there is compote in most bites.
- Using a butter knife or skewer, lightly drag through the dollops in a few gentle passes. Keep the motion shallow, like you are drawing on the surface, rather than stirring the compote down into the batter. Stop swirling while you can still clearly see ribbons of blueberry.
Bake
- Bake for 20 to 25 minutes. Start checking at 20 minutes since every oven is slightly different.
- The edges should look set and lightly golden, and the center should look slightly soft but not wet. If you insert a toothpick into a plain section, it should come out with moist crumbs, not raw batter.
- Remove from the oven and place the pan on a cooling rack. Let the blondies cool completely in the pan for at least 1 hour. Cooling time matters because the blondies finish setting as they cool.
Slice and Finish
- Once fully cooled, lift the blondies out using the parchment overhang and transfer to a cutting board.
- Slice into 16 squares using a sharp knife, wiping the blade between cuts for cleaner edges.
- If you want a little extra contrast, sprinkle lightly with flaky sea salt before serving.
Nutrition
Serving: 1squareCalories: 306.92kcalCarbohydrates: 41.23gProtein: 2.97gFat: 15.04gSaturated Fat: 9.15gPolyunsaturated Fat: 0.72gMonounsaturated Fat: 4gTrans Fat: 0.47gCholesterol: 55.52mgSodium: 95.22mgPotassium: 85.23mgFiber: 0.83gSugar: 29.67gVitamin A: 400.87IUVitamin C: 2.2mgCalcium: 38.55mgIron: 0.92mg
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