The night before, add all ingredients except fresh strawberries to a bowl and stir until well combined.
In a separate bowl, add strawberries and use a fork to mash them up to your desired consistency.
Take two jars and spoon ¼ of the oat mixture into each one. Spoon ¼ of the mashed strawberries into each jar. Repeat the process with oat mixture and top with remaining mashed strawberries.
Cover the jars and place them in the fridge overnight.