Blueberry Sour Cream Pie

2   cups sour cream
3   Tbsp. flour
3   Tbsp. light brown sugar
1   egg, beaten
1   (9 in.) graham cracker crust (unbaked)
1/2 cup firmly packed light brown sugar
2   cups fresh blueberries

Combine sour cream, flour and brown sugar; add 
egg and beat well.  Place 1/2 of the mixture 
into the graham cracker crust. Mix blueberries 
and 1/2 cup brown sugar together, then spread 
over sour cream mixture.  Cover berries with 
remaining cream mixture.  Bake for 25 minutes 
at 400 degrees.  Chill several hours.