Blend: Place oats in a blender or food processor and blitz into a rough powder, about 10 seconds.
Cook: Transfer oats to a large microwave-safe serving bowl. Add water, stirring to evenly mix. Microwave on high for 1½ to 2 minutes, or until oats have absorbed the water.
Stir: Add egg whites while oats are still hot, stirring to combine. Add more water, as needed, to reach a creamy consistency to your liking. Stir in optional (but highly recommended!) brown sugar, cinnamon, and salt.
Serve: Serve warm, topped with your favorite oatmeal toppings (like sliced banana, almond butter, and berries!)
Notes
Food Safety: Stirring the egg whites into the hot oatmeal should "cook" the eggs to the point that they are safe to eat. If you're worried about food safety, stir egg whites into cooked oatmeal, then pop back in the microwave for 30 seconds.