Trim fat from pork chops; cut pork into 2- x 1/4-inch strips. Combine pork, soy sauce, and sherry; cover and marinate in refrigerator 30 minutes. Drain; discard sherry mixture.
Combine egg whites and egg in a medium bowl; stir well with a whisk. Place a large nonstick skillet or wok coated with cooking spray over medium-high heat until hot.
Add egg mixture; cook 2 minutes or until egg is done. Remove egg mixture from skillet.
Add 1/2 teaspoon oil to skillet. Add pork; stir-fry 2 minutes or until done. Remove pork from skillet; keep warm. Add 1/2 teaspoon oil to skillet. Add sliced onion and snow peas; stir-fry 2 minutes.
Add mushrooms, ginger, and garlic; stir-fry 1 minute. Remove onion mixture from skillet, and keep warm.
Add 1 teaspoon oil to skillet; add rice, and cook 1 minute without stirring. Stir in egg mixture, pork, onion mixture, and salt, and stir-fry 1 minute or until thoroughly heated. Sprinkle each serving with about 1 tablespoon green onions.