Bring a large pot of salted water to a boil. Add the penne pasta and cook according to package instructions, about 10-12 minutes, until al dente. Drain and set aside.

In a large skillet, melt 2 tablespoons of unsalted butter over medium heat. Add the ground beef, breaking it apart as it cooks. Sauté for 6-8 minutes until browned.

Stir in minced garlic, salt, and pepper. Continue to sauté for 1-2 minutes until garlic is fragrant.

Fold the drained penne into the skillet with the beef mixture. Add another tablespoon of melted butter if desired. Stir for 2-3 minutes.

Sprinkle in cheddar cheese, stirring until melted and creamy. Mix in Parmesan cheese for extra flavor.

Serve hot, garnished with parsley if using.