Bring a large pot of water to a boil with 1 tablespoon of kosher salt. Add the pasta and cook until al dente; drain and set aside.

Meanwhile, heat 2 tablespoons of olive oil in a sauté pan or deep skillet over medium heat. Add the sausage and cook for 2 minutes, breaking it into smaller pieces. Add the onion and cook, stirring, until the sausage is browned and no longer pink and the onion is translucent. Add the garlic and crushed pepper flakes and cook for 1 minute longer.

Add the tomatoes, tomato paste, and sugar to the pan and bring to a simmer. Reduce the heat to low and cook for 5 minutes.

Add the milk, Parmesan cheese, and drained pasta to the pan. Cook, stirring, until heated through.

Garnish with chopped parsley, and pass the Parmesan! Enjoy!