Preheat your oven to 375°F (190°C).
Mince the garlic clove finely.
Heat the extra virgin olive oil in a small oven-safe skillet over medium heat.
Add the garlic and baby spinach to the skillet, sautéing until the spinach is completely wilted and fragrant.
Spread the spinach evenly across the bottom of the skillet or transfer it to a small baking dish.
Pour the liquid egg whites over the spinach base.
Carefully crack the two whole eggs on top of the egg whites, keeping the yolks intact.
Sprinkle the crumbled feta cheese, sea salt, black pepper, and red pepper flakes over the top.
Place the dish in the oven and bake for 12 to 15 minutes, or until the egg whites are fully set but the yolks remain slightly runny.
While the eggs bake, toast the sourdough bread until crisp.
Remove the eggs from the oven and serve immediately alongside the warm, crunchy toast.