PREPARATION:

1. Spray 10-inch nonstick skillet with cooking spray; heat over medium-high heat. Add sausage, oregano and red pepper flakes, if desired. Cook until browned. Drain on paper towels.
2. Spray 8-inch square baking dish with cooking spray. Line bottom of pan with bread. Sprinkle sausage evenly over bread; top with bell pepper and parsley.
3. Combine egg substitute, milk, mustard and black pepper in medium bowl; whisk until well blended. Pour egg mixture evenly over sausage. Cover tightly with foil and refrigerate overnight.
4. Preheat oven to 350°F. Bake, covered tightly, 55 minutes. Remove foil. Sprinkle with cheese and bake 5 minutes or until cheese is melted. Cut into 4 wedges before serving.