01 -
Set oven temperature to 350°F (175°C) and allow it to preheat.
02 -
In a mixing bowl, whisk together eggs, milk, salt, and black pepper until smooth and uniform.
03 -
Heat olive oil in a 10-inch oven-safe skillet over medium heat. Add chopped onions and bell peppers, sautéing until softened, about 5 minutes.
04 -
Incorporate chopped spinach into the skillet and cook until wilted, approximately 2 minutes. If using, fold in cooked bacon or sausage.
05 -
Pour the egg mixture evenly over the sautéed vegetables and meat. Stir gently to ensure even vegetable distribution.
06 -
Sprinkle shredded cheese atop the egg mixture. Cook undisturbed for 5 minutes until the edges begin to set.
07 -
Transfer skillet to the preheated oven. Bake for 15 minutes or until eggs are completely set and the surface attains a light golden hue.
08 -
Remove from oven and allow the dish to rest briefly. Slice into wedges and serve warm or at room temperature.