1 cup white sugar
1 teaspoon baking powder
3 cups all-purpose flour
1 cup cold unsalted butter (2 sticks or 8 ounces)
1/4 teaspoon salt
Zest and juice of one lemon (I actually used Limoncello that I had in the refrigerator)
4 cups fresh blueberries (I used frozen, unthawed, and they worked great!)
1/2 cup white sugar
4 teaspoons cornstarch
1. Preheat the oven to 375 degrees F (190 degrees C). Grease a 9×13 inch pan.
2. In a medium bowl, stir together 1 cup sugar, 3 cups flour, and baking powder. Mix in salt and lemon zest. Use a fork or pastry cutter to blend in the butter and egg. Dough will be crumbly. Pat half of dough into the prepared pan.
3. In another bowl, stir together the sugar, cornstarch and lemon juice. Gently mix in the blueberries. Sprinkle the blueberry mixture evenly over the crust. Crumble remaining dough over the berry layer.
4. Bake in preheated oven for 45 minutes, or until top is slightly brown. Cool completely before cutting into squares.