Special Rhubarb Cake with Vanilla sauce

4  tablespoons		butter (no substitutes), softened
1-1/4  cups		sugar
1		egg
1-1/4  cups		all-purpose flour
1  cup		oat flour
1  teaspoon		baking powder
1/2  teaspoon		baking soda
1/2  teaspoon		salt
1  cup		fat free buttermilk
3  cups		chopped fresh or frozen rhubarb

Tip: For nutritional information on all the ingredients in Special Rhubarb Cake with Vanilla sauce just click on each ingredient name. Then adjust the serving size for any Special Rhubarb Cake with Vanilla sauce ingredient with the serving size tool in the nutrition facts area to the right to see how you can save calories, carbs and more.

In a mixing bowl, cream 2 tbsp butter and 1 cup sugar. Beat in egg. Combine 1 cup flour and 1 cup oat flour, baking powder, baking soda and salt; add to creamed mixture alternately with buttermilk, beating just until moistened. Fold in the rhubarb. Pour into a greased 9-in. square baking dish.

Combine topping ingredients - 1/4 cup sugar, 2 tbsp melted butter and 1/4 cup flour ; sprinkle over batter. Bake at 350 degrees F for 40-45 minutes or until a toothpick comes out clean. Cool on a wire rack.