Whisk eggs with cheese and chives and season with salt and pepper and a few drops hot sauce. Preheat a large nonstick skillet over medium heat. Add butter or extra-virgin olive oil to the pan. Heat butter or oil, then add eggs. Add the optional addition, if desired, at this point. Scramble to desired consistency and serve with a sliced plum tomato per person, seasoned with salt and pepper, alongside the eggs. Pass garlic toast at table: rub hot toast with cracked garlic, then butter as usual.