In a mixing bowl, stir together oats, protein powder, cinnamon and salt.
In a separate bowl, whisk together milk, maple syrup and vanilla, then pour over dry mixture and stir well to combine.
Cover the bowl (or transfer to tupperware) and let sit in the refrigerator for at least 4 hours, or preferably overnight.
To serve, microwave frozen fruit of choice for 45-60 seconds, mash with the back of a fork, and swirl into the overnight oats (or serve on the bottom of the jar/container). Feel free to add other toppings, like granola, nut butter, nuts or seeds, coconut, etc.
