In a large pot, bring salted water to a vigorous boil. Add the penne pasta and cook according to the package instructions until it reaches an al dente texture. Once done, drain the pasta in a colander and set it aside.
In a spacious skillet, heat the olive oil over medium heat. Once shimmering, add the shredded chicken and sauté for approximately 2-3 minutes, or until heated through. Stir frequently to ensure even heating.
In a mixing bowl, blend together the softened cream cheese, ranch seasoning mix, and chicken broth. Stir vigorously until the mixture is completely smooth and well combined, ensuring no lumps remain.
Pour the creamy ranch mixture over the chicken in the skillet. Stir continuously to coat the chicken evenly with the sauce.
Reduce the heat to low, then sprinkle the freshly shredded cheddar and mozzarella cheese into the skillet. Gently stir the mixture until the cheeses melt completely.
Add the cooked penne pasta to the skillet, tossing gently to ensure all ingredients are well incorporated. Season with salt and freshly ground black pepper according to your taste.
Remove the skillet from heat and fold in the finely chopped green onions for an added fresh flavor burst. Serve immediately while hot.
Notes
Serve with garlic bread or a crisp green salad for a complete meal.