Starting with a cold skillet, heat tortilla about 45 seconds or until warm, turning once. Place tortilla into a greased 15-ounce casserole. Top with 1/4 cup of the cheese.
In same skillet cook sausage and green pepper until sausage is cooked and green pepper is crisp-tender; drain well. Spoon over tortilla and cheese in casserole.
In a small bowl combine egg, milk or cream, and salt. Mix well. Pour egg mixture into casserole. Top with remaining cheese. Bake in a 350 degree F oven for 30 to 35 minutes or until firm. Serve with salsa and cilantro, if desired. Makes 1 serving.