Preheat your oven to 375°F (190°C).
In a medium-sized bowl, whisk together the large eggs, egg whites, sea salt, and black pepper until the mixture is well combined and slightly frothy.
Heat the ghee in an 8-inch oven-safe skillet over medium heat.
Dice the Canadian bacon and yellow onion, then add them to the skillet, sautéing for about 4 minutes until the onion is translucent and the bacon is lightly browned.
Add the fresh baby spinach to the skillet and stir for 1 minute until just wilted.
Pour the egg mixture over the bacon and vegetables in the skillet, tilting the pan to ensure the eggs reach all the edges.
Sprinkle the shredded sharp cheddar cheese evenly over the top of the eggs.
Transfer the skillet to the preheated oven and bake for 12 to 15 minutes, or until the center is set and the top is a beautiful golden-brown.
Remove from the oven, garnish with chopped fresh chives, and let it rest for 2 minutes before slicing into wedges.