Put oats into a clean 8 oz wide mouth mason jar. Top with the Greek yogurt and then pour in the milk.
Nestle frozen blueberries or blueberry puree cube into the oats.
Cover and seal jar and put in fridge for at least 12 hours or up to one week.
When you are ready to eat the overnight oats, give them a good stir to make sure all ingredients are well incorporated. If desired, top with additional fresh blueberries or other toppings of your choosing.
Notes
If you like your oats a little bit creamier, add a bit more liquid. If you like them to have a bit of a bite, add a bit less.
You can easily make multiple jars of overnight oats with blueberries at a time. Simply double, triple or quadruple the recipe as needed.