This was much better than I had expected! I was afraid it might be runny and make the casserole runny but it was very thick. My daughter and son-in-law actually thought the baked chicken salad casserole tasted better with this than it usually does with the soup! And the grandkids didn't know anything was different about it. :)
I make this with corn starch instead of the flour substitute and it turned out perfect. I also use 3/4 milk and 1/4 cup (or a little more) chicken stock instead of the bouillon since I can't find a bouillon without sugar.
My daughter (gluten sensitive) loved this sauce tonight. I added to this recipe: 10 oz low fat milk, 2 oz of fat free cream cheese, 1 Tbs of sodium free chicken bouillon, 1 tsp Mrs Dash Garlic & Herb, & 1/2 tsp celery seed, in a sauce pan, heating until melted and thickened, and poured it over browned chicken pieces. Made a nice Gluten Free, Low Sodium Chicken & Rice dish. I made this with the gluten free flour and thought it was a little too flour-y tasting. Next time I'll try it with 1/2 flour and 1/2 corn starch.