Mix together 1 yogurt and 1/3 cup of uncooked oats.

Once mixed, pour 1 Tablespoon of milk into the mixture and mix.

Pour 1/3 of mixture into the mason jar, followed by a layer of berries.

Add another layer of the mixture followed by by a layer of berries, and then add the last of the mixture.

Repeat steps 1 through 3 for the two (2) remaining Mason jars.

Put filled Mason jars into the fridge overnight.