Cook 1 pound lean ground beef and 1/4 cup chopped onion until meat is brown. Spoon off excess fat, sprinkle 1 tablespoon flour over meat and toss, stir in one 8 ounce can tomato sauce, 1/4 cup chopped green pepper, 1 teaspoon oregano, 1/2 to 1 teaspoon chili powder and 1/2 teaspoon salt. While doing this, peel and cut up and steam 1 small eggplant. Season with salt and pepper. Mix with meat mixture. Cover and simmer a few minutes. Top with shredded American cheese (1 cup) and serve.