Cook bacon in non-stick skillet over medium heat, or in microwave until crisp; fold in half and set aside. Wipe skillet clean.
Whisk together egg, onion powder, salt and pepper, in small bowl. Pour mixture into skillet; cook stirring slightly over medium heat. As mxture begins to set, gently move spatula across bottom and sides of skillet to form large, soft curds. Cook until eggs are thickened and no visible liquid egg remains but are still moist.
Spread tortilla with mayonnaise. Place lettuce on top. Add bacon, egg and tomato.