Soak the oats in water (until covered) and 1 tsp of acid/culture of choice (eg. apple cider vinegar, lemon juice or whey). Cover with a tea towel and place in a dry, warm place (such as the pantry) overnight (or at least 6 hours). When ready to use, drain in a colander or sieve and rinse.
Place all ingredients in saucepan over low heat (if using collagen or banana add them in now).
Occasionally stir and cook over low heat until thick and milk is mostly absorbed (approximately 5 minutes).
Add to bowl and top with any nutrient dense toppings you wish.