Whip up these scrumptious Sheet Pan Chicken Fajitas for a fast and mouthwatering weeknight dinner! Just mix chicken, peppers, onions, and all your go-to fajita seasoning onto a sheet pan. Then, roast it all to perfection in the oven. It's as simple as that! Serve these tender fajitas with warm tortillas, your most loved toppings like guacamole, an