Blueberry Sour Cream Pie

Blueberry Sour Cream Pie
Filling
1 cup sugar
3 T. flour
1 1/4 cup sour cream
1 egg
1 1/2 teaspoons vanilla
1 teaspoon lemon juice
1 teaspoon lemon zest
1/4 teaspoon salt
3 cups blueberries
1 pie shell

Topping
3 T. flour
2 T sugar
2 T cold butter, cut into small cubes

Preheat oven to 350
In a large bowl or in your mixer bowl, beat together sugar and flour.  Then add sour cream, egg, vanilla, lemon juice, zest, and salt. Mix until well blended.

By hand, gently fold in the blueberries.
Pour the filling into a prepared crust.  Bake for 40 minutes.  While it's baking, make the topping by mixing together the flour and sugar, then cutting in the cold butter until crumbly.
Remove pie and sprinkle on topping.
Return pie to oven and bake another 20-30 minutes or until topping is golden brown and the pie is set in the center.
Remove pie.  Cool, then chill until well set.