preheat oven to 350. coat a 2 1/2 quart backing dish with nonstick cooking spray

in large skillet brown ground beef,onion and green bell pepper over medium hight heat 6-8 minutes or untill beef is no longer pink, stirring frequentlly. drain excess liquid

add spaghetti sauce, maccaroni,water,garlic salt and black pepper,mix well

pour mixture into backing dish.cover and bake 25 minutes

uncover and top with mozzarella cheese and bake 15-20 minutes more till cheese.has melted and casserole is heated through