Preheat oven to 425F.
¼ cup bean flour (I use mung bean, but you can also use lentil, chickpea or a mixture of two or three--be creative!)
¼ cup rice flour
½ cup equal parts arrowroot (I dont eat corn, but cornstarch would do as well), potato starch, and rice bran
½ teaspoon xanthan gum
2 teaspoons baking powder
¼ teaspoon salt
Mix the flour above with 1 ½ tablespoons of margarine or butter until small pea-like lumps form (you dont have to be too careful about this step, especially if the margarine is soft). Beat in 1 egg, ½ teaspoon vanilla, 2 tablespoons of milk or water. Mix to form a fairly thick dough. Put into a buttered square or round dish or pie plate. Top with sliced fruit: Plums, peaches, etc, densely covering the dough. Sprinkle with cinnamon and sugar. Dot the top with bits of margarine or butter and bake for 25 minutes.