Preheat your oven to 375°F (190°C).
In an 8-inch oven-safe skillet, cook the bacon over medium heat until it is browned and crispy.
Remove the bacon from the skillet, let it cool slightly, then chop it into small pieces.
Discard all but 1 teaspoon of the bacon fat from the skillet, then add the baby spinach and sliced green onions.
Sauté the vegetables for 1-2 minutes until the spinach is wilted and the onions are fragrant.
In a medium bowl, whisk together the large eggs, liquid egg whites, sea salt, and black pepper until well combined.
Stir the chopped bacon and half of the shredded cheddar cheese into the egg mixture.
Pour the egg mixture into the skillet over the sautéed vegetables, spreading them evenly.
Sprinkle the remaining cheddar cheese over the top and transfer the skillet to the oven.
Bake for 12-15 minutes, or until the eggs are set in the center and the edges are golden brown.