Add the oil to a large pot over medium heat. Add in sausage and break it up with a wooden spoon so it’s not in big chunks. Cook for about 5 to 7 minutes until it’s no longer pink. Drain the excess fat.

Add onions and cook for about 7 minutes until softened. Add in the garlic, oregano, salt, and red pepper flakes and cook an additional minute.

Stir in tomato paste and continue to cook for another minute.

Add in diced tomatoes with juices, chicken broth, and bay leaves. Bring to a boil, then reduce heat to low, cover, and simmer for about 30 minutes.

Increase the heat to medium-high and add in uncooked pasta. Cook for about 10 minutes or until pasta is tender. Remove from heat and take out the bay leaves.

Stir in the fresh basil and season with salt and pepper.

To serve, add a dollop of ricotta to each bowl. Top with soup and sprinkle mozzarella cheese on top.