Combine old fashioned oats, brown sugar, cinnamon, chia seeds, and salt in an 8 oz. Mason Jar.
Pour in milk.
Stir or shake to combine, making sure all ingredients are mixed in evenly to avoid clumps of chia or brown sugar.
Put the lid onto your mason jar and place it in the fridge.
Refrigerate for 15 minutes or up to 12 hours before enjoying.
