Step 3
To the still-warm skillet over medium heat, add a bit more olive oil and the veggies. Season with salt and pepper and sauté to desired doneness. I like to start with onions and tomatoes, then add mushrooms, and end with spinach so each has proper time to cook. Set aside.
Remove skillet from heat and make sure it’s coated with enough oil so the omelet doesn’t stick. Add back 1/4 of the veggies and spoon on the omelet batter, spreading it gently with a spoon or rubber spatula, being careful not to tear or cause gaps. The thinner and more evenly you can spread it the better. So you may not end up using it all.
Cook over medium heat on the stove top for 5 minutes until the edges start to dry. Then place in oven and bake until dry and deep golden brown – 10-15 minutes. The longer it bakes the less soft/wet it will be, so if you prefer a more “well done” omelet, cook closer to 15 or more.