Prepare the Base
In a mason jar or bowl, combine the oats, milk, yogurt, chia seeds (if using), honey/maple syrup (if using), and a pinch of salt.
Stir everything together until well combined.
Add Flavor Mixins
Depending on the flavor you want, add the corresponding ingredients to the oat mixture and stir to combine.
Chill Overnight
Cover the container and refrigerate for at least 8 hours or overnight.
The oats will absorb the liquid and become soft and creamy.
Serve and Enjoy
Give the overnight oats a quick stir before serving.
Top with any additional toppings, such as fresh fruit, nuts, or a drizzle of honey.