Combine the oats, chia seeds and a pinch of salt in a bowl or glass jar.
Add in the milk, yogurt, peanut butter and vanilla extract. Give it a good stir.
Roughly chop the peanuts with a knife. Stir them into the overnight oats.
Make the caramel by combining peanut butter and maple syrup. Add a splash of water to thin it out until it reaches the desired consistency.
Melt the chocolate in a small double boiler in the microwave at 20-second intervals at 700W.
Fill a small jar with a few teaspoons of the oat mixture and cover it with caramel and chocolate. Place it in the fridge for 3-5 minutes until the chocolate solidifies. Repeat with another layer of oats, caramel and chocolate.
Cover with plastic film or close with a lid and place in the refrigerator to set for at least 4 hours (preferably overnight).