In a large pot of boiling salted water, cook the penne pasta according to package instructions until al dente. Drain and set aside.
In a large skillet over medium heat, add the chicken breasts. Season with salt, pepper, and sprinkle the ranch seasoning mix over the top.
Sauté the chicken for about 7-8 minutes on each side, or until cooked through and no longer pink in the center. Remove from heat and allow to cool slightly.
Shred the cooked chicken using two forks and return it to the skillet.
Add the softened cream cheese and chicken broth to the skillet. Stir until creamy and well-combined. Allow the mixture to bubble gently for about 3-4 minutes.
Add the cooked penne to the skillet and toss everything together until the pasta is well coated in the creamy sauce.
Stir in the shredded cheddar cheese until melted and creamy. If using bacon, add it now.
Garnish with sliced green onions before serving. Adjust seasoning with more salt and pepper if needed.