Add kefir, frozen strawberries, banana, chia seeds, maple syrup, and vanilla to a blender.
Blend until smooth and creamy.
Pour into a glass and serve immediately.
Notes
No Kefir: Use plain whole-milk Greek yogurt instead
Protein</b: Add more protein if you want to use this for a breakfast smoothie. It contains around 11.5 g of protein as is. Add a 1-2 scoops of protein powder.