In a medium bowl, mix together gluten-free rolled oats, chia seeds, oat milk, vanilla extract, and a pinch of salt until fully combined. Adjust sweetness by adding maple syrup.

Cover the bowl tightly or transfer into airtight jars. Refrigerate for at least 2-3 hours or ideally overnight.

In a mason jar, add a generous dollop of Nutella at the bottom, followed by the chilled oat mixture, leaving space for toppings.

The next morning, give the oats a gentle stir. If too thick, add a splash of oat milk. Top with additional Nutella, sliced bananas, or chopped hazelnuts.