Preheat oven to 350 degrees. Cook spaghetti according to package directions; drain. Return to warm pan; toss with oil. Stir in egg substitute.
Meanwhile, heat medium skillet over medium heat. Brown ground beef and bell pepper until beef is no longer pink and pepper is tender, stirring to break up beef; drain. Stir in salsa and corn.
Coat 9-inch deep dish pie plate with cooking spray. Press spaghetti mixture onto bottom and up sides of pie plate. Top with beef mixture. Bake 25-30 minutes or until heated through.
Top with cheese. Let stand 5-10 minutes. Serve with cherry tomatoes and cilantro, if desired.