well poo... I loaned that book to my sister and she's out of town for a month. The recipe actually calls for cocoa powder.. not chile powder to go along with the smoked paprika.

Here's the closest I could find on the web.

1 head cauliflower, cut into bite-sized chunks of approximately equal size.
~1 tsp. Spanish smoked paprika (sweet, not hot, though if you wanted to throw in a bit of a hot chile powder, I bet that would be nice.)
~1/2 tsp. ground cumin
olive oil, salt, and pepper

Steps
Preheat the oven to 450 degrees.
Toss the cauliflower in a bowl with enough olive oil to lightly coat. Add the spices and salt and pepper to taste, and toss to coat.
Roast in a baking pan in the oven until tender and lightly browned, stirring every 10 minutes or so. (My cauliflower took about 25 to 30 minutes).

I think if you tossed in a tsp of cocoa powder into that mix.. you'd be pretty close.

I know of at least 2 other FTers with that cookbook (Gluten-Free Girl) so maybe they'll chime in.