In large bowl, toss together spaghetti, egg substitute, 2 teaspoon olive oil, Parmesan cheese and parsley; set aside.
In large nonstick frying pan, heat last 2 teaspoons of oil; add beef and saute for 2 minutes, breaking up chunks. Add bell pepper and scallions. Cook, stirring, 4-5 minutes, until vegetables are tender and beef is no longer pink. Stir in remaining ingredients except mozzarella cheese; simmer 5-6 minutes, until sauce thickens. Remove from heat and stir in 1 ounce of the mozzarella.
Preheat oven to 350°F Spray a 10" pie plate with nonstick spray; spread spaghetti mixture on plate, lining bottom and pressing up sides to form the crust. Cover with foil and bake 30 minutes. Uncover, sprinkle with remaining mozzarella cheese; bake 15 minutes longer. Let stand 10 minutes before serving.