Add oats to a jar or other suitable container, and top with your favourite plant milk. Add the vanilla extract, maple syrup, and chia seeds, then stir with a spoon until evenly combined. Cover and leave refrigerated overnight.
In the morning, take the jar from the fridge and pour the mixture into a breakfast bowl. Slice the peach into segments and add to the bowl together with a handful of fresh raspberries.
Place the hazelnuts onto a chopping board. Cover them with a clean tea cloth, and taking a wooden spoon, give the hazelnuts a light tapping so that they break up into rough pieces.
Sprinkle the hazelnuts over the bowl and serve. Top with more plant milk as required.