Classic Pizza Soup with Sausage, Pepperoni, and Mozzarella

Ingredients

• 1 tablespoon olive oil
• 1 pound Italian sausage, casings removed
• 1 medium onion, diced
• 1 medium green bell pepper, diced
• 2 garlic cloves, finely diced
• 1 teaspoon dried oregano
• 1/2 teaspoon dried basil
• 1/2 teaspoon dried marjoram
• Salt
• freshly ground black pepper
• 1 can (14 ounces) crushed tomatoes
• 1 cup tomato sauce
• 1 teaspoon sugar
• 4 cups chicken stock
• 4 ounces pepperoni, quartered
• 6 to 8 fresh basil leaves, shredded
• 4 ounces mozzarella cheese, grated