1/2 cup low fat graham cracker crumbs |
butter-flavored cooking spray |
1 package sugar-free lemon gelatin |
1 cup boiling water |
2 cups plain nonfat yogurt |
2 packets splenda sugar substitute |
1 1/2 cups fresh blueberries or 1 1/2 cups frozen blueberries |
1 tablespoon powdered sugar |
1 (16 ounce) container frozen light whipped topping, thawed |