Trim crust from bread; discard or save crust for another use. Spray inside of large custard cup or ramekin (about 1 cup/250 mL size) with cooking spray. Press bread into custard cup. Spoon salsa onto bread. Crack egg over top. Sprinkle green onion, green pepper and cheese over egg. Microwave on High (100% power) until yolk is cooked as desired, 1 to 2 minutes.