Question: how to make kfc chicken crispy again?
Answer: Let the second-day chicken rest in room temperature for thirty minutes and preheat oven to 400°. ... 
Cover a baking sheet with foil and arrange chicken on it. ... 
Place another sheet of foil on top to insulate the chicken. ... 
Bake for 20 minutes. ... 
Let chicken rest for 5 minutes and check for crispiness.