1/4 cupfresh blueberriesoptional; sliced in half and folded in right at the end before adding the berry sauce
Lemon Glaze
1/2cuppowdered sugar
1tbsplemon juice
Instructions
Preheat an oven to 350 F. Line a square baking pan with parchment paper or cooking spray.
In a medium saucepan, combine the berries, lemon juice, sugar, and cornstarch for the blueberry sauce. Heat over medium low heat, stirring frequently, until the sauce thickens and the berries soften. Press the berries with the side of the spoon to help pop them open. Set aside and let it cool down slightly.
Add melted butter, sugars, lemon zest, and extract to a medium bowl. Whisk to combine.
4 oz unsalted butter, 1/2 cup brown sugar, 1/2 cup white sugar, lemon zest, 1 tsp lemon extract
Add the egg. Whisk to combine.
1 egg
Fold in the flour, salt and baking powder with a rubber spatula. Stir until combined but without overmixing. (If adding extra fresh blueberries, fold them in now.)
1 cup flour, 1/2 tsp baking powder, 1 tsp kosher salt; use less if using fine or table salt, 1/4 cup fresh blueberries
Pour the blondie batter into the pan, spreading in an even layer.
Pour the blueberry sauce over top of the batter and use a kitchen knife to swirl it in for that feathered look.
Bake for 45-50 minutes or until a toothpick placed in the center comes out clean.
Remove from the oven and allow to cool for 10-15 minutes at room temperature. Transfer to a wire rack to finish cooling completely.
Whisk together the ingredients for the glaze and drizzle over top. Let the glaze set, then slice and serve!