The dish can be made ahead up to this point and held, covered, in the refrigerator for a few hours or overnight. Let the pan sit on the counter for an hour before baking to warm up a bit. Warning! The sauce is very spicy. I served it on the side. The chicken and vegetables are flavorful and have tolerable heat, but the sauce brings that heat to another level. Serve the sauce not the side if you have a delicate palate.