Step 1

Preheat broiler. Heat oil in a 12-inch cast-iron skillet over medium heat. Add sausage and cook, breaking it up with a spoon, until beginning to brown, 4 to 6 minutes. Add garlic and cook, stirring, until fragrant, 1 minute.

Step 2

Add chicken stock, marinara, and tomatoes. Nestle pasta pieces in broth mixture, and bring to a boil. Reduce heat and simmer, covered, 4 minutes. Uncover and continue simmering, stirring occasionally, until pasta is tender, 10 to 12 minutes.

Step 3

Remove from heat and fold in basil. Top with ricotta, mozzarella, and Parmesan. Broil until golden brown, 2 to 3 minutes.