Best Meatball Sub Soup Recipe - How to Make Meatball Sub Soup

Ingredients

• 1 lb. ground beef
• 1/2 c. Italian bread crumbs
• 2 cloves garlic, minced
• 1/4 c. fresh Italian parsley, chopped
• 1 tsp. crushed red pepper flakes
• kosher salt
• Freshly ground black pepper
• 2 tbsp. extra-virgin olive oil
• 1 large onion, diced
• 1 large clove garlic, minced
• 2 tbsp. tomato paste
• 1 28-oz. can crushed tomatoes
• 3 c. low-sodium beef broth
• 1 c. skim milk
• 3 c. shredded mozzarella
• 1/2 c. freshly grated Parmesan
• 1 tsp. dried oregano
• Baguette slices, for serving