1 (.35 oz.) pkg. sugar free Jello (strawberry or other flavor)
1 (8 oz.) container low fat plain yogurt
1 tsp. vanilla
1 banana, mashed (or crushed pineapple or mandarin oranges, drained)
Water (or liquid from canned fruit)

Mix Jello in 1 cup boiling water and dissolve. Add 3/4 cup cold water, vanilla and yogurt. Blend thoroughly. Fold in fruit. Put mixture in 4 serving dishes and chill.