Preheat oven to 350º F. Spray a mini muffin pan generously.
Heat olive oil in a skillet. Sauté ham, red pepper, and red onion for 4–5 minutes.
In a mixing bowl, whisk eggs and milk. Add salt, pepper, and cheddar cheese.
Stir in green onions and the sautéed mixture.
Divide mixture into mini muffin pan wells.
Bake for 14–16 minutes, until golden.
Cool slightly and remove from pan.
