Ingredients
1cupsugar,plus extra ⅓ cup for blueberries
1tspbaking powder
3cupsall-purpose flour
1cupunsalted butter
1egg
1tspvanilla extract
½tspsalt
zest of 1 lemon
4cupsfresh blueberries
3tbspcornstarch
Preparation
Preheat the oven to 375 degrees F. Grease a 9×13-inch pan.
In a medium bowl, stir together sugar, flour, salt, lemon zest, and baking powder. Use a food processor, pastry cutter, or fork to blend in the butter, egg, and vanilla. Dough will be crumbly. Pat half of the dough into the prepared pan.
In another bowl, stir together the sugar and cornstarch. Gently mix in the blueberries. Sprinkle the blueberry mixture evenly over the crust. Crumble remaining dough over the berry layer.
Bake in preheated oven for 45 minutes, or until top is slightly brown. Cool completely before cutting into squares.
