Boil a large pot of salted water. Add penne pasta and cook until al dente, about 9-11 minutes. Drain and set aside.

In the same pot, heat olive oil over medium-high. Add cubed chicken seasoned with salt and pepper. Cook until golden, about 5-6 minutes.

Sprinkle ranch seasoning over chicken, stirring well to coat and infuse flavor.

Reduce heat to low, mix in softened cream cheese until melted and creamy, about 2-3 minutes.

Slowly add chicken broth and milk, stirring to combine and simmer gently for 3-5 minutes.

Add cooked penne to the sauce, stirring to coat thoroughly and cook for an additional 2-3 minutes.

Stir in shredded cheddar cheese until melted into the sauce, about another 2-3 minutes.

Taste and adjust seasoning with additional salt, pepper, or ranch seasoning as needed.

Garnish with chopped green onions or parsley and serve immediately while warm.