How do you make Ketchup Doritos? I have been craving these for years, and I can't find a recipe.

Frito-Lay made Ketchup flavored Doritos a few years ago. Unfortunately they didn't sell very well and were discontinued not to long after being introduced. Me and a few friends were obsessed with them. I won't admit to how many bags I ate, but it consumed most of my snack budget :)

I've called Frito-Lay many times, and talked to a few of their delivery staffers about their lack of Ketchup Doritos, and the response was not good. The chance of them ever coming back is very bad.

So I turn to my last hope: Making them myself! Do you have a recipe for them? Even if it isn't the actual recipe, if it's your own proprietary blend I'm willing to give it a shot.
I don't have a recipe, but if you had say a dehydrator, ketchup, and whatsit--dextrose?--that helps dry things resist clumping, you could make your own. I believe Ferran Adria carries a powder product, on his website albertyferranadria.com.

Add the powder to your own tortilla chips that you've just fried, and should work. 

Alternatively, multiplex movie theatres often have several different shakers of flavourings--cheese, sour cream/onion, that sort of thing. Perhaps Costco would carry something similar.