I haven't tried it but here's another version for those wanting to take a risk - sammieswife.
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It was bound to happen. In their "Will They Build It?" series, TopCultured has done the only reasonable thing left to the KFC Double Down: Give it a bun. A bun that is a Krispy Kreme Doughnut. And extra "Colonel's Sauce."
The mad scientists behind this explain:
With all the KFC Double Down hype recently (from the Double Double Down to the Quad Down and more) we knew we had to one-up all the madness that is this meat monster of a sandwich. What to do? Well the choice is obvious. Take the infamous Double Down and the fabled Luther Burger and make the KFC & Krispy Kreme Fried Chicken Luther Double Down Sandwich.So what you've got here is one tasty mother of a sandwich that starts with a half Krispy Kreme glazed doughnut, extra Colonel's Sauce (gotta get in those added calories where you can), fried chicken breast, Colonel's Sauce, cheese slice, bacon, cheese slice, fried chicken breast and other half doughtnut.
A Luther Burger is any hamburger with a glazed donut standing in for a bun, currently popularized in the form of the infamous Krispy Kreme Bacon Cheesburger, and cash cow for the "This Is Why You're Fat" brand.
The KFC Krispy Kreme Double Down, a.k.a., the "Luther Double Down," coming in at 900 calories:
Step-by-step photos and instructions here.