B-listers displayed hidden talents on Dancing With the Stars and Skating With Celebrities, but how well can famous folk compete in the kitchen? Find out on the new Diddy-produced series Celebrity Cooking Showdown, in which top chefs like Wolfgang Puck will train stars for Iron Chef-type battles. The five-episode limited series debuts on NBC in April. Alas, no word on who the competiting celebrities will be (submit your casting suggestions below), but I hope one of them is Christopher Walken, who appeared on the Independent Film Channel’s Split Screen a few years ago and fired up a recipe called ”Exploding Shrimp.” As Emeril would say, ”Bam!”