01 -
Preheat oven to 350°F. Line a 9x13 inch glass baking dish with parchment paper and set aside.
02 -
Using a stand or hand mixer, whisk eggs on high until very frothy. Add 1.5 cups granulated sugar and continue whisking until mixture is foamy and thickened.
03 -
Add melted butter, lemon juice, lemon zest, vanilla extract, and lemon extract or oil. Beat on medium speed until fully combined.
04 -
In a separate bowl, whisk together flour and baking powder.
05 -
Add the flour mixture to the wet ingredients and mix just until combined.
06 -
Gently fold in 1.5 cups fresh blueberries until evenly distributed.
07 -
Spread batter evenly in prepared dish. Bake for 30 minutes or until a toothpick inserted in the center comes out clean.
08 -
In a small saucepan over medium heat, combine 0.5 cup blueberries, 0.5 cup granulated sugar, and 1 tablespoon water if needed. Stir constantly until sugar dissolves and mixture becomes syrupy.
09 -
Strain syrup through a sieve into a bowl containing 0.5 cup powdered sugar. Whisk to combine, adding 1 to 2 tablespoons heavy cream or milk to achieve a spreadable consistency.
10 -
Spread glaze over warm bars and allow them to cool completely before cutting into squares and serving.