Heat an 8-inch nonstick skillet over medium heat. Melt 1/2 teaspoon butter in pan; swirl to coat. Add egg mixture to pan; cook 60 seconds or until eggs are the consistency of very soft scrambled eggs (center will still look wet), stirring constantly with a rubber spatula. Tilt pan while stirring to fill any holes with uncooked egg mixture. Run spatula around edges and under omelet to loosen it from pan. Push one end of omelet up onto front lip of pan. Roll other end of omelet toward lip to close omelet. Turn out onto a plate, seam side down. Repeat with remaining salt, pepper, eggs, and butter.
