In a medium mixing bowl, combine rolled oats, chia seeds, milk, Greek yogurt, and maple syrup. Stir until fully combined.

Fold in chocolate chips until evenly distributed throughout the mixture.

Divide the mixture into jars, leaving room for expansion. Secure lids tightly.

Chill in the refrigerator for at least 4 hours or overnight.

In the morning, stir the oats and add toppings like fresh fruit or nut butter before serving.