In a clean mason jar or bowl, add 1 cup of old-fashioned rolled oats along with 1 cup of your choice of milk. Stir in 2 tablespoons of brown sugar, 1 tablespoon of chia seeds, and a splash of vanilla extract, along with a dash of cinnamon and a pinch of salt.

Using a spoon or small whisk, mix the ingredients well until the oats are fully submerged in the liquid. Ensure the brown sugar dissolves completely and the chia seeds are evenly distributed.

Cover the mason jar tightly with its lid or transfer the mixture into an airtight container. Place it in the refrigerator and let it chill overnight.

When ready to serve, give the oats a good stir and top with fruits and nuts, if desired. Serve cold or warm in the microwave for 30–40 seconds.