I substituted 1 1/2 cups rice flour and and 1/2 cup chick pea flour for wheat flour in this recipe with 2 very ripe bananas and a cup of frozen black raspberries from Trader Joe's.
The result was very dry muffins that tasted like beans (and banana and raspberry.) I guess you can't have everything. You can't be gluten-free and low fat. Or maybe you can but I still can't figure it out.
Nevertheless, I ate all the muffins in a week - can't let food go to waste.