Crack 1 egg into a small bowl. Season with 2 pinches of salt and a dash of pepper. Stir with a fork until completely blended and no streaks remain.
Bring a 10-inch skillet to low-medium heat. Add 1 teaspoon butter and let it melt completely, swirling to coat the bottom of the pan.
Pour in the egg mixture and immediately tilt the pan so the egg covers the entire surface in a thin, even layer. Place a lid on the skillet and cook for about 30 seconds, or until the top of the egg is set but still slightly glossy.
Remove the lid and use your spatula to gently fold the omelet in half while it's still in the warm pan. Slide directly onto your breakfast sandwich or plate and serve immediately.