In a large bowl combine the oats, chia seeds, cacao powder, milk, ¼ cup maple syrup, 2 tablespoons hazelnut butter, vanilla, and 1 pinch of salt.
Cover and refrigerate for a minimum of 45 minutes, or overnight.
Make a ganache: Pour the cream into a small saucepan and warm on medium heat for 3 minutes.
Add the chocolate chips, remaining hazelnut butter, remaining maple syrup, and remaining salt. Stir for 5 minutes until melted, then remove from heat and cool for 10 minutes.
Transfer to a glass container and refrigerate for 30 minutes.
Add the hazelnuts to a dry skillet and toast on medium heat for 5 minutes, shaking the pan frequently.
To assemble, spoon half of the oats mixture into 3 jars.
Add a layer of the ganache.
Add another layer of the oats mixture.
Distribute the whipped cream to each jar.
Top with toasted hazelnuts, cacao nibs, and optional fruit. Serve right away.