In a medium-sized bowl or jar, add rolled oats, chopped dark chocolate, and your preferred sweetener. Mix these dry ingredients together until evenly distributed.

Pour in your choice of milk, or a non-dairy alternative, into the bowl with the dry mixture. Stir well for about 30 seconds.

Gently fold in the fresh raspberries, being careful not to crush them too much.

Cover the bowl or jar with a lid or plastic wrap, and place it in the refrigerator. Let the mixture rest for at least 8 hours or overnight.

Once ready to serve, give the mixture a quick stir, and if desired, top with additional raspberries or chocolate shavings.