In a jar or container, mix ½ cup old fashioned oats and 1 cup kefir until well combined. If adding chia seeds, mix them in the night before (at this step) so that they can help the oats and kefir thicken.
Add frozen fruit on top and cover with a lid to refrigerate overnight.
In the morning, add any other desired toppings and enjoy!
Notes
If meal prepping, make the night before and eat the next morning after the fruit has defrosted.
If not meal prepping, oatmeal can be made in the morning with fresh fruit instead of frozen. Allow 15 minutes after stirring for the kefir and oats to thicken.