Place the blueberries, banana, Greek yogurt, vanilla, cinnamon, and milk in your blender and puree until smooth. If needed, scrape down the sides of the blender with a spatula occasionally.
If the smoothie seems too thick, add more milk 1 tablespoon at a time, until you reach your desired consistency. Enjoy immediately.
Notes
Optional add-ins
Protein Powder - Need an extra protein boost? Add a scoop of your favorite protein powder.Sweetener - If you like a sweeter smoothie, you can add a teaspoon or two of honey and pure maple syrup. If you’re trying to keep your sugar consumption low, you can always use a sugar alternative (stevia or monk fruit) to sweeten your smoothie.Spinach - You can turn this into a blueberry banana spinach smoothie by adding a handful of spinach to the blender. The spinach will alter the color of the smoothie a bit but not the taste.
Storage
Store in an airtight container in the refrigerator for up to 1 day. Freeze smoothies for up to 3 months by storing them in an airtight freezer-safe storage container. Thaw overnight in the refrigerator before serving.