Cook the penne pasta according to package instructions until al dente, then drain.
In a large skillet, add the cooked chicken, cream cheese, chicken broth, and ranch seasoning mix over medium heat.
Stir the mixture until the cream cheese is fully melted and the sauce is smooth and homogenous.
Add the cooked penne to the sauce, stirring well to combine.
Stir in the shredded cheddar cheese until melted and fully incorporated.
Season with salt and pepper to taste, and sprinkle with chopped green onions before serving.
