Preheat oven to 350°F.
Whisk together eggs and egg whites until combined.
Heat a cast iron skillet to medium heat.
Heat about 1 T olive oil in skillet.
Add spinach and onions cook until onions are translucent and spinach is wilted.
Add garlic and stir to combine.
Stir in sweet potatoes. If they are coming from the fridge, heat for several minutes.
Pour egg mixture over the vegetables in skillet. Add sea salt and pepper to taste.
Spread avocado evenly over the dish.
Move skillet to the oven and bake for about 10-12 minutes or until egg is cooked through in the center.
Serve immediately with your favorite breakfast (or dinner!) sides.