Finnish Blueberry Squares - cooking recipe

Ingredients

PASTRY
1 cup butter, softened
1/2 cup sugar
2 3/4 cups flour
1/4 teaspoon salt
1/2 teaspoon vanilla
1 egg
FILLING
3 cups fresh blueberries or 3 cups frozen blueberries
1 cup sugar
3 tablespoons cornstarch
1 teaspoon powdered sugar (optional)

Preparation

In large bowl, combine butter and 1/2 cup sugar; blend well. Lightly spoon flour into measuring cup; level off. Add flour, salt, vanilla and egg; blend well. Cover; refrigerate until firm, about 2 hours ( sometimes make the day before).
In medium saucepan, combine blueberries, 1 cup sugar and cornstarch. Cook over medium heat until mixture comes to a boil, stirring constantly. Boil 3 minutes or until thickened, stirring constantly. Remove from heat to cool.
Heat oven to 375 degrees F. Pat 2/3 of chill dough into a 13X9-inch pan, pressing 1/2 inch up sides. Spread blueberry mixture evenly over dough. Roll out remaining dough to 1/4-inch thickness. Cut into 1/2-inch wide strips. Arrange strips in lattice design over filling. (Strips may break apart but will break together.) Trim and seal edges. I use fork tines to seal.
Bake at 375 degrees F for 30 to 40 minutes or until top is golden brown. Cool. Sprinkle with powdered sugar, optional and cut into squares.