In a blender or food processor, combine the old-fashioned oats, chia seeds, ground flax seeds, peanut butter, maple syrup, and plant-based milk.
Blend the ingredients until smooth and well combined. You can leave a few pieces of oats if you some texture to your oats. The mixture may be a little runny but it will thicken up over time.
Make your simple raspberry chia jam by mashing the raspberries with the back of fork in a small bowl. Add the chia seeds and mix until combined.
Optional: Create a fun layered look! In a jar, add half of your blended oats, then a layer of the raspberry jam, then more oats, and one more layer of the jam. Top with the last of your blended oats. You could also just add the raspberries on top.
Seal the jar or container tightly and refrigerate overnight, or for at least 4 hours, to allow the oats to soften and the flavors to meld together.
The next morning, remove jar from fridge and top for more raspberries and a drizzle of peanut butter if desired. Enjoy!