In a soup pot, combine the pork sausage, chopped onions, and chopped bell pepper.

Sauté the mixture over medium heat until the sausage is fully cooked and browned.

Drain any excess grease from the pot.

Add the drained sliced mushrooms, pizza sauce flavored with pepperoni, and diced Italian-style tomatoes (with basil, oregano, & garlic) to the pot.

Pour in 3 to 4 cups of water, depending on desired consistency.

Bring the soup to a simmer over medium-high heat.

Cook for about 10 minutes, stirring occasionally.

Stir in the shredded Parmesan Cheese.

Keep the soup hot until ready to serve.

Ladle the hot soup into bowls.

Top each serving with a generous sprinkling of shredded Mozzarella cheese.