1 qt        Blueberries (Fresh or frozen)
3/4 C      Sugar
2 tbs      Corn Starch
1 C         Water
1/2 tsp   Vanilla
1 C         Flour
3/4 C      Rolled oats
1 C         Brown sugar
1 tsp      Ground Cinnamon
1/2 C      Butter or Margarine(melted)

Spread the blueberries (Fresh or frozen) in the bottom of a 13"x9"x2" baking pan. (Do not grease) In a small sauce pan over medium heat combine the sugar, corn starch, and water. Cook and stir until thick and clear then add the vanilla. Pour over, then carefully stir in with blueberries Combine the flour, rolled oats, brown sugar and ground cinnamon. Add the melted butter or margarine to the oat mixture. Mix until crumbly, then place over the top blueberries as best as you can. There will be a few bare spots. Bake at 350F for 30 to 40 minutes, or until blueberry mixture bubbles, and the topping is brown.