Combine the oats, milk, yogurt, chia seeds, and honey/maple syrup (if using) in a bowl.
Toss your raspberries in a jar/container and use a fork to smash them. You can leave bigger chunks or mash until they're smooth. *if you're not going to eat the oats the next morning, I would wait to add the raspberries so they don't go bad!
Pour oats over top and cover with a lid. Place in the fridge for at least 8 hours, preferably overnight. In the morning, give it a good mix before digging in, and you can top it with fresh raspberries and dark chocolate chips.