Brown ground beef and garlic in a medium to large skillet. In the meantime, prepare a separate pot of boiling water for the macaroni. When the beef is cooked and browned, add crushed tomatoes and Italian seasoning and stir to combine. Bring to a simmer let sauce thicken while you add the macaroni to the boiling water. Cook pasta until tender and drain. Toss sour cream and salt with the macaroni, then add the spaghetti sauce to the macaroni pot and stir until well combined. Sprinkle mozzarella over top and put a lid on the pot. Let it sit for about 5 minutes to allow the cheese to melt, then serve immediately.