Chop the onion and garlic finely.
Cut the asparagus and artichoke hearts.
Grate the cheese.
In a frying pan with a little oil, sauté the garlic and onion until the onion changes color. Then add the asparagus (cook for 1 minute)
Mix the egg and whites with the milk and the yogurt in a bowl, add the other ingredients, empty the mixture into a baking dish and bake at 356 °F for 35-45 minutes.