Step 1
Start by heating your oven to 350°F (175°C) and lightly grease a 13x9-inch baking dish. In a bowl, mix together the rice flour, soy flour, tapioca starch, cinnamon, baking soda, baking powder, nutmeg, and ginger until everything is well combined. In a separate large bowl, use an electric mixer to beat the margarine until it’s nice and creamy. Slowly add the brown sugar and keep beating until the mixture lightens up a bit. Next, add the eggs one at a time, making sure each one is fully mixed in before adding the next. When you add the third egg, also stir in the pumpkin and vanilla. Gradually add the dry ingredients to the wet mixture, stirring until just combined into a smooth batter. Pour the batter into your prepared dish and pop it in the oven. Bake for about 30 minutes, or until a toothpick inserted in the center comes out clean. Let it cool a bit before digging in!
