This recipe uses egg substitute to reduce the fat, calories and cholesterol.
Preheat the oven to 350 F. Line a jellyroll pan (15 1/2 inches by 10 1/2 inches) with aluminum foil. Coat generously with cooking spray.
In a large bowl, combine the flour, milk, margarine and egg substitute. Stir until well blended. Pour the flour mixture into the jellyroll pan and sprinkle with ham and onion.
Bake until eggs are set, about 15 minutes. Immediately sprinkle with cheese and spinach. Roll up, beginning at narrow end and using foil to lift and roll the omelet. Cut into 6 equal slices, each about 2 1/2 inches long.
Arrange additional spinach leaves on serving plate. Add the omelet and serve immediately.
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