Usually, since I'm a bachelor, there's nothing here to make with them, so they are plain. But at work, I'll get them with salt, pepper, tomatoes, and some pieces of homefries if they have them available. I love potatoes and eggs together.
I usually make a milk omelette cooked in light butter w/ diced red bell peppers, chive and tomato. Then artichoke cream cheese if I have some. Salt and pepper as well of course. Chicken advised.
Another version is an omelette cooked in olive oil w/ bell pepper, onion, garlic, light paprika and some chipotle shot sauce, light salt, no black pepper. Served in a tortilla. Chicken or sausage optional.