Preheat your oven to 375°F.
Heat the olive oil in a 10-inch oven-safe skillet over medium heat.
Add the diced yellow onion and red bell pepper to the skillet and sauté for 5 minutes until softened.
Crumble the Beyond Breakfast Sausage patties into the pan and cook for 3 minutes until browned and fragrant.
Stir in the baby spinach and cook just until wilted, then spread the mixture evenly across the bottom of the skillet.
In a separate bowl, whisk together the eggs, egg whites, sea salt, and black pepper until well combined.
Pour the egg mixture over the sausage and vegetables in the skillet, ensuring it covers everything evenly.
Sprinkle the crumbled feta cheese over the top of the egg mixture.
Transfer the skillet to the oven and bake for 15 to 18 minutes until the eggs are fully set and the edges are golden.