Make the Shortcakes: Adjust oven rack to middle position. Preheat oven to 425 degrees F.
In bowl of food processor, pulse together sorghum flour, brown rice, flour, potato starch, tapioca starch, granulated sugar, baking powder, salt, and xanthan gum. (Don't have a food processor? Use a medium bowl and whisk ingredients together.)
Make Easy Strawberry Shortcake: Toss sliced strawberries with confectioners' sugar. Allow berries to stand for about five minutes. Split shortcake in half. Top shortcake with berries and drizzle with cream or spoon whipped cream on top of berries.