1. Put all ingredients into blender container. Cover and process on high speed until smooth.
Chocolate: Omit vanilla. Add 2 Tbsp. chocolate flavored syrup.
Tropical: Omit vanilla. Reduce milk to 1/2 c. Add 1 can (8 oz.) juice pack crushed pineapple and 2 Tbsp. cream of coconut.
Strawberry: Omit vanilla. Increase milk to 1 1/4 c. Add 1 pkg. (10 oz.) frozen strawberries, slightly thawed.