Preheat your oven to 350°F. In a large oven-safe skillet, sauté chopped asparagus and onions in olive oil until tender. Whisk together eggs, milk, salt, and pepper in a bowl, then pour over the asparagus mixture. Cook on the stovetop for a few minutes until the edges start to set, then transfer to the oven and bake for 10-15 minutes, until the eggs are set and slightly browned. Serve hot or cold.
