Fry sausage in a frying pan until cooked thoroughly and crumbled. Set aside.
Saute carrots for three minutes in olive oil on med to high heat. Add green pepper and continue for another three minutes. Add mushroom and onion and continue for two more minutes. Set aside.
Prepare stuffing as instructed. Once complete, add all the fried ingredients to stuffing, mixing with a fork to maintain fluffiness. Place in a casserole dish and top with mozzarella cheese. Sprinkle grated Parmesan cheese on top. Bake covered in a 350 degree oven for 15 minutes.