Preheat oven to 350°.
Bring 1/2 cup water to boil in a small saucepan; gradually stir in couscous. Remove from heat; cover and let stand 5 minutes. Fluff with a fork.
Combine 1 tablespoon water, salt, black pepper, egg whites, and eggs in a medium bowl, stirring with a whisk.
Heat a 10-inch ovenproof nonstick skillet coated with cooking spray over medium-high heat. Add bell pepper, onion, and garlic; sauté 5 minutes. Stir in couscous and egg mixture; cook over medium heat 5 minutes or until almost set. Sprinkle with cheese. Bake at 350° for 10 minutes or until set. Let stand 5 minutes before serving.
Cooked couscous makes this meatless entrée more filling. Substitute 1 cup leftover cooked orzo, spaghetti, or vermicelli, if you prefer.