Absolutely! Bananas are packed with nutrients and are an excellent alternative to processed sweets in moderation (e.g. 1 per day). Use "natural" peanut butter with minimal additives - look for "peanuts" and "salt." The protein in the peanut butter, the good fats in an avocado and nutrients in the bananas make this smoothie a complete breakfast. If you're counting calories, keep toppings to a minimum.