Place all ingredients in a blender. Process until thick and smooth. Serve immediately.
Notes
Using frozen fruit is the key to a thick, creamy smoothie. I like to slice overripe bananas, wrap them individually, and then stash them in the freezer to grab for smoothies whenever we need them.
You can start with fresh blueberries (and freeze them in 1/2-cup portions) or you can purchase a bag of unsweetened frozen blueberries in the freezer section at the grocery store.
Add a squeeze of lemon juice to the smoothie for a bright, fresh burst of flavor.
We use vanilla flavored Greek-style yogurt, but you can substitute with plain Greek yogurt to reduce the amount of sugar in the smoothie. If you're using plain yogurt, I suggest adding a dash of vanilla extract for flavor, as well as a bit of honey or other sweetener of choice (if desired).
I use 2% milk in the smoothies because that's what my boys prefer; however, you can substitute with any variety of milk or non-dairy milk alternative (such as almond milk).
Make a Banana Blueberry Spinach Smoothie by adding a handful of baby spinach leaves to the blender. It won't change the taste of the smoothie, but it will add some great nutrients!
Prepare a Blueberry Banana Peanut Butter Smoothie by adding a tablespoon or two of peanut butter to the blender for staying power and healthy fats.
Make it a Blueberry Banana Oatmeal Smoothie by including a 1/4-cup of raw oats in the blender. It will thicken the drink, add fiber, and make it even more filling.