1Heat butter in 8-inch omelet pan or skillet over medium-high heat just until butter begins to brown. As butter melts, tilt pan to coat bottom. Cook ham, bell pepper and onion in butter 2 minutes, stirring frequently.
2Quickly pour eggs into pan. While sliding pan back and forth rapidly over heat, quickly stir with fork to spread eggs continuously over bottom of pan as they thicken. Let stand over heat a few seconds to lightly brown bottom of omelet. (Do not overcook—omelet will continue to cook after folding.)
3Tilt pan and run fork under edge of omelet, then jerk pan sharply to loosen eggs from bottom of pan. Fold portion of omelet nearest you just to center. (Allow for portion of omelet to slide up side of pan.) Turn omelet onto warm plate, flipping folded portion of omelet over so it rolls over the bottom. Tuck sides of omelet under if necessary.