Using a piece of paper towel wipe the pan out; then spray with a bit more of the non-stick spray. Return the pan back to the stove over medium heat; add in the egg-whites. I like to scramble the egg-whites a bit with my spatchula in the center of the pan. This incorporates a bit of air into the omelette; then allow the omelette to cook until the top is just about set (at this point if you wanted you could just continue to scramble the eggs and serve them that way too).
Once the omelette is just about done use your spatchula to flip the omelette over; cook for an additional minuet. You can then use your spatchula to fold the egg-whites over into a crepe style (in half, then fold in half a second time, so it looks like a piece of pie). Place the eggs on top of the ham, onion and pepper mixture. Salt and Pepper to taste and serve immediately; there's nothing worse than cold eggs.