To make this Chipotle Chicken Pasta Recipe gluten-free, substitute the penne pasta with a certified gluten-free pasta variety, such as chickpea, brown rice, or quinoa pasta. Additionally, ensure that the chipotle fajita seasoning and chipotle paste are gluten-free, as some brands may contain additives with gluten. The rest of the ingredients remain naturally gluten-free, allowing for a seamless adaptation of this dish.