Coat a 10-inch nonstick ovenproof skillet with cooking spray; place over medium-high heat until hot. Add ham and red pepper; cook, stirring constantly, 3 minutes. Add potatoes and next 3 ingredients; cook, stirring constantly, 4 to 5 minutes or until vegetables are tender.
Reduce heat to medium-low. Add egg substitute; stir gently. Cook 2 to 3 minutes or until nearly set. Place skillet in oven, and bake at 450° for 3 to 4 minutes or until set. Sprinkle with cheese while frittata is hot.