Sauté the Asparagus: Heat the olive oil in an oven-safe frying pan over medium heat. Add the asparagus and cook it for 3 minutes, until it begins to soften.
Prepare the Egg Mixture: In a bowl, beat together the tomato, eggs, salt, black pepper, and milk until well combined.
Cook the Eggs: Pour the egg mixture into the skillet with the asparagus and cook it for 3 minutes, until it just begins to set.
Add the Cheese: Sprinkle the crumbled feta cheese evenly over the top.
Bake: Transfer the skillet to the oven and bake for 10 minutes, until the eggs are fully set.