Oatmeal Layer: In a small bowl, combine the oats and milk (or water), and microwave for 2-2.5 minutes (or until oats are cooked). Stir in the mashed banana and salt and sweetener.
Assemble the Parfait: In a mason jar, or bowl, begin to layer the parfait, starting with yogurt layer, then the blueberries, then the oatmeal layer. Continue to layer until all of the ingredients are gone! (I personally did 2 layers of each, but it will vary based on the size of jar/bowl you use). Enjoy immediately, or refrigerate until ready to eat, (or overnight for a quick and easy breakfast the next morning!)