Blueberry Crumble Bars – Brownie Mischief

Ingredients

• 1 cup (128g) all purpose flour
• 1/3 cup (66g) packed brown sugar
• 3 tablespoons (38g) granulated sugar
• 1/4 teaspoon cinnamon
• 1/4 teaspoon fine sea salt
• 6 tablespoons cold, unsalted butter, cubed
• 1 1/2 cuts (191g) all purpose flour, sifted
• 1/4 cup plus 2 tablespoons (42g) powdered sugar, sifted (plus extra for sprinkling on top)
• 1 teaspoon baking powder
• 3/4 cup (170g) unsalted butter, room temperature
• 3 1/2 cups(454-510g) blueberries
• 1 teaspoon lemon juice
• 2/3 cup (131g) granulated sugar
• 2 teaspoons cornstarch