There are a couple ways to make this shake without ice cream. One option is to substitute the ice cream for about 2 additional frozen bananas. Blended bananas are really smooth and will give you a nice shake consistency. Another option, is to substitute the ice cream for Greek yogurt. This will give you a smoothie instead of milkshake, but it'll be good too. Try this Strawberry Banana Peanut Butter Smoothie recipe.