Tried this with arrowroot... turned into a slimy mess. Then of course I looked up arrowroot in my Food Substitutions Bible and read "Arrowroot starch should not be used as a thickener for dairy-based sauces, since it turns them slimy". Sigh!
so cheesy, so light, so white. Did it w/ potato starch although I bet cornstarch is much better. Had no fresh parsley on hand either so used dried. Love the garlic here. Thanks for sharing. :)