In a lidded jar, combine the oats, milk, yogurt, and a pinch of salt. Stir well to combine.
Dollop the jam over the top. It will sink into the mixture and disappear. This is fine and completely normal.
Place the peaches and raspberries on top. Screw the lid onto the jar and chill in the fridge for 8 hours or overnight. The oats are best enjoyed within 2 days.
Notes
Let it thicken--The oat mixture will be very thin and liquid-y after stirring together. This is normal and the mixture will thicken overnight as it sits.
Dietary--This recipe is suitable for gluten-free and vegetarian diets. Be sure to check that your oats are certified gluten-free, if this is a dietary concern.