In a large ovenproof skillet coated with cooking spray, cook and stir the potatoes in oil over medium heat until tender. Stir in ham; heat through.
In a small bowl, whisk the egg whites, eggs, 1/4 cup cheese, milk and oregano; add to the pan. Arrange red pepper strips over egg mixture to resemble the spokes of a wheel. Cover and cook over low heat for 8-12 minutes or until almost set.
Uncover; broil 6 in. from the heat for 3-5 minutes or until eggs are set and frittata is golden brown. Sprinkle with remaining cheese; let stand until melted. Cut into wedges.
Meanwhile, in a small saucepan, combine salsa and cilantro; heat through. Serve with frittata.