1 ready crust butter flavor pie crust
2 (8 oz.) containers blueberry yogurt
1 (8 oz.) frozen whipped topping, thawed
1 (10 oz.) pkg. frozen blueberries, thawed (reserve 18 blueberries for garnish)

In medium bowl fold blueberry yogurt into whipped topping. Process thawed blueberries into chunky pieces. Fold blueberries into yogurt mixture. Pour into crust. Freeze 3 hours. Remove from freezer 15 minutes before serving. Garnish with blueberries.