In a medium bowl, combine rolled oats, chia seeds, oat milk, vanilla extract, and a pinch of salt. Stir the mixture thoroughly until blended.

Taste the mixture. If you prefer it sweeter, drizzle in maple syrup to taste and stir again.

Divide the oat mixture into 4 jars, adding a dollop of Nutella into each jar and swirl gently. Seal and refrigerate for at least 2-3 hours.

Before serving, stir each jar well. If too thick, mix in a splash of oat milk until your desired consistency is reached.

Garnish with toppings like sliced bananas or additional Nutella, then serve cold.