Heat oven to 375°F. Spray cookie sheet with nonstick cooking spray. Place tostada shells on sprayed sheet. Bake at 375°F. for 5 to 6 minutes or until hot and crisp, turning once.
Meanwhile, in medium bowl, combine egg product, milk, salt and pepper; mix well.
Heat oil in medium nonstick skillet over medium heat until hot. Add onion and bell pepper; cook 4 to 5 minutes or until tender. Add egg product mixture; cook until set, stirring occasionally.
Top each warm tostada shell on cookie sheet with 2 tablespoons refried beans, 1/4 of scrambled egg mixture, 1 tablespoon red chili sauce and 1/4 cup cheese.
Bake at 375°F. for 8 to 10 minutes or until cheese is melted.