<<Disclaimer: Verify this information before applying it to your situation.>> Hi All-- I'm attending my first office potluck luncheon since being totally gf and need help with substitutions in this recipe - specifically, what kind of flour should I sub for regular flour, and what brand of sour cream is gf (I live in Kansas) and haven't seen Breakstone brand. I could probably find a Kroger brand, but don't know if that's gf. (This is a really terrific variation on the standard green bean casserole with mushroom soup) Here goes: 1/2 tsp grated onion 2 Tbs butter or margarine 2 Tbs flour 1/2 tsp sugar 1/2 tsp salt 1/2 c. milk 1/2 c. dairy sour cream 2 to 3 cans cut green beans, drained 1 c. shredded cheese 1 c. cornflakes or crumbs 2 Tbs margarine or butter, melted Cook onion in skillet about 1 min. w/butter. Blend in flour, sugar, salt. Add milk and cook until thick. Remove from heat and add sour cream. Add beans. Spread 1/3 of bean mixture in qt. casserole. Sprinkle cheese over beans; repeat layers, ending w/beans. Top w/cornflakes or crumbs mixed with melted margarine. Bake at 400 degrees for 20 minutes. Any help anyone can give me would be so greatly appreciated. I won't be able to eat anything else that's being brought, so I wanted at least one thing there that I could eat. Thanks so much... Ayn