Old fashioned oats or quick oats ?

The recipe for these WholeFlour Breakfast Cookies says to use "rolled oats." I've always understood that to mean old-fashioned oats, and have never had a problem proceeding that way. I would use those in this recipe - but if all I had in the pantry were quick oats, I wouldn't hesitate to use those, either! The texture will be a bit different (not as hefty, one would think), but they'll be okay. ;o)