Blueberry Pie
["1 baked (9-inch) pie shell", "2 1/2 c. fresh blueberries, divided", "1 c. sugar", "3 Tbsp. cornstarch", "1/4 c. water", "1 Tbsp. margarine", "1 tsp. vanilla extract", "1 (4 oz.) Cool Whip"]
["Pour 1 1/4 cups blueberries into prepared pie shell; spread evenly and set aside.", "Combine 1 cup blueberries, sugar, cornstarch and water in medium saucepan; cook and stir over low heat until thickened.", "Remove from heat; stir in margarine and vanilla. Cool.", "Pour over blueberries in pie shell.", "Chill.", "Spoon whipped topping around edge.", "Garnish with 1/4 cup blueberries."]
["shell", "fresh blueberries", "sugar", "cornstarch", "water", "margarine", "vanilla extract"]