Step 1
Preheat the oven to 350 degrees. In a large bowl, whisk the eggs until well combined. Whisk in the milk, cheddar cheese, salt, and pepper. Set aside.
Step 2
In a heavy skillet, add olive oil over medium heat. Add the onions and cook for 3-4 minutes until softening. Add the spinach and cook for 3-4 minutes until wilted.