This sentence beginning has become so common — and so stupid — I don't understand its popularity.
Famous chef Emeril Lagasse is a constant practitioner. While demonstrating the preparation of some recipe, he starts by saying, "What we're gonna do is we're gonna…". That's nothing more than saying, "What we're gonna do is we're gonna do."
Why can't Emeril and others simply say something like, "Now we're going to roast this chicken"? Instead they say, "What we're gonna do is we're gonna roast this chicken." Wasted words — and crappy grammar.
Beginning every sentence — regardless of the subject, not just cooking — with a "What we're gonna do…" is ridiculous.