Cook and crumble the ground sausage and minced garlic in a large skillet pan, over medium-high heat, until the sausage is no longer pink. Drain the excess grease from the skillet pan.
Cover the skillet pan with a lid and reduce the heat to medium-low. Let cook for 20-25 minutes or until the noodles are cooked to al dente, or softer depending on preference.
Lay the mozzarella cheese slices over top and cover the pan with the lid. Turn off the heat and allow the pan to sit for 5 minutes so the cheese melts and softens, and the sauce can thicken.