Hello. Thank you for your question about Chex® Mix. Since we have so many different kinds of Chex® mix recipes, I cannot answer for all of them, but if you are talking about the Original Chex® Mix, I would say that you can crisp it in the oven.
I suggest you use a 325°F oven and bake it about 5 to 10 minutes. Watch it carefully to be sure that it isn't browning too much.
Answered 12/06/2012 by Marcia-BettyCrocker