Combine the rolled oats, water or milk, and salt in a small saucepan over medium-high heat.

Bring the mixture to a gentle boil, then reduce the heat to medium-low to maintain a simmer.

Cook for approximately 5 minutes, stirring occasionally, until the liquid is mostly absorbed but the oats are still moist.

Slowly pour the liquid egg whites into the saucepan while whisking or stirring constantly and vigorously to prevent the eggs from scrambling.

Continue to cook and whisk for 2 to 3 minutes until the oatmeal becomes thick, fluffy, and opaque.

Remove the saucepan from the heat and stir in the vanilla extract, cinnamon, and sweetener.

Transfer to a bowl and serve immediately with desired toppings.