One of my favorite summer treats from one of my favorite blogs, A Perfect Bite. Perfect for barbecues and picnics.
Blueberry Crumb Bars
3 cups all-purpose flour
1/2 cup light brown sugar
1/2 cup + 1/4 cup granulated sugar, divided use
1 teaspoon baking powder
1 cup cold butter (2 sticks or 8 ounces)
1 egg, beaten
1 teaspoon of vanilla extract
1/4 teaspoon salt
Zest and juice of one lemon
4 cups blueberries
4 teaspoons cornstarch
Optional: Confectioners' sugar for dusting
1) Preheat the oven to 375 degrees F. Butter and flour a 9 x 13 baking pan.
2) In a medium bowl whisk together 3 cups of flour, 1/2 cup brown sugar, 1/2 cup granulated sugar, baking powder, salt, and lemon zest. Use a pastry cutter or fork to cut in butter until mixture is in pieces no larger than a pea. Mix in egg and vanilla extract. Dough will be crumbly but stick together when squeezed. Pat half of the dough into the pan.
3) In another bowl, mix reserved 1/4 cup granulated sugar, cornstarch, and lemon juice. Add blueberries and gently toss them to coat. Pour blueberry mixture on top of the dough in pan. Then crumble remainder of dough evenly over surface of berries.
4) Bake in the preheated oven for 45 to 60 minutes, or until the top is slightly browned. Cool completely, then cut into squares. Dust with powdered sugar if using. Can be refrigerated for several days. Yield: 15 bars.