Whip out these amazing Sheet Pan Chicken Fajitas for a fast and mouthwatering weeknight dinner! Just toss chicken, peppers, onions, and all your go-to fajita seasoning onto a sheet pan. Then, roast it all to crispiness in the oven. It's as straightforward as that! Serve these juicy fajitas with warm tortillas, your favorite toppings like salsa, an