In a small dry skillet over medium heat, toast the chopped pecans for 2-3 minutes until fragrant and golden, then set aside.
In a medium saucepan, combine the rolled oats, water, ground cinnamon, and sea salt.
Bring the mixture to a gentle boil over medium-high heat, then reduce to a simmer.
Once the oats have absorbed most of the water, slowly pour in the liquid egg whites while whisking constantly and vigorously to incorporate them without scrambling.
Continue to cook and whisk for 2-3 minutes until the oatmeal is thick, voluminous, and creamy.
Remove from heat and stir in the vanilla extract.
Transfer the oatmeal to a bowl and top with the non-fat Greek yogurt.
Sprinkle the toasted pecans and brown sugar over the top before serving warm.