2 (8 oz.) containers fruit-flavored yogurt
Mashed fruit (optional) - strawberries, blueberries, crushed pineapple (drained)
1 (8 oz.) container of Cool Whip
Graham cracker crust

Fold yogurt and fruit into Cool Whip, blending well. Spoon into crust. Freeze until firm, about 4 hours. Remove from freezer and place in refrigerator for 30 minutes or longer for softer texture before cutting. Store leftovers in freezer.