Preheat your oven to 375°F. Lightly coat a muffin tin with cooking spray to prevent sticking.
In a mixing bowl, combine the shredded potatoes, garlic powder, salt, and pepper. Toss the ingredients together until the potatoes are evenly coated with the seasonings.
Divide the seasoned shredded potatoes evenly among the muffin cups, pressing them down gently to form a crust at the bottom and going up the sides.
Place the muffin tin in the preheated oven for 20 minutes, until the hashbrowns turn golden brown.
While the hashbrowns cook, in another bowl, whisk together the liquid egg whites the the rest of the ingredients. Set aside.
Once the hashbrowns are golden, remove from the oven. Divide the egg mixture into each muffin tin over the hashbrowns.
Place the muffin tin back in the oven and bake for approximately 20-25 minutes, or until the egg whites are set and the muffins turn golden brown on top.
Once cooked, remove the muffins from the oven and allow them to cool for a few minutes. Use a butter knife or spatula to gently loosen the edges and remove the muffins from the tin.
Serve the Hash Brown Egg White Muffins warm and enjoy them as a convenient, protein-packed breakfast on the go.