<<Disclaimer: Verify this information before applying it to your situation.>> Hi, I recently tried this recipe with GF ingredients (and our new spring rhubarb), and was very pleased with the result. It is also very good with blueberries instead of the rhubarb. So I thought I'd share...hope you enjoy it! RHUBARB COFFEE CAKE 1/2 cup margarine 1-1/2 cups white sugar 1 tsp vanilla 1 egg 2 cups GF flour mix (e.g B.Hagman's) 1 tsp xanthan gum 1/2 tsp salt 1 tsp baking soda 1 cup milk 2 cups chopped rhubarb Topping: 1/2 cup brown sugar 1/2 tsp cinnamon Mix margarine and sugar together; beat in egg and vanilla. Mix in dry ingredients followed by milk, then finely chopped rhubarb. Pour into greased pan then sprinkle mixed topping on top.Bake in 9x13 inch pan at 350 degrees F for 35-40 minutes. Half this recipe works well in an 8x8 inch pan. Joanne in Ontario