I found this recipe at Simply Gluten Free, which is one of my very favorite gluten free sites. I’ve never made anything of Carol’s that hasn’t turned out beautifully. Well, not as beautiful as Carol’s, or maybe she’s a better photographer. Or both.
In any case, here are the directions, copied and pasted because why not. Be sure to visit her site!
Ingredients
1½ cups white rice flour
1 cup tapioca starch
½ cup sweet rice or glutinous rice flour plus more for kneading
½ cup powdered milk
2 teaspoons sugar
1½ teaspoons kosher salt
5 teaspoons baking powder
1 ½ teaspoons baking soda
½ cup (1 stick) cold unsalted butter, cut into small pieces
½ cup vegetable shortening
1 large egg
1 cup buttermilk
¼ cup melted butter, optional
Directions
Preheat oven to 500 degrees.
Combine the white rice flour, tapioca starch, sweet rice (glutinous) flour, powdered milk, sugar, salt, baking powder, and baking soda in a food processor. Pulse several times to combine. Add the butter and shortening and pulse several times until the mixture resembles coarse crumbs with some larger pieces. Add the egg and buttermilk, pulse to combine. Flour a work surface generously with sweet rice flour, dump the dough onto the flour and knead several times until the dough is no longer sticky.
Pat the dough into a circle a full 1 inch thick; the circle will not be very large in diameter. Cut out 3 inch biscuits using a well-floured cookie cutter or the top of a drinking glass. Place the biscuits into a cast iron skillet or non-stick 9 inch round cake pan. Reform the scraps and cut until the dough is used, you should have seven 3 inches by 1 inch biscuits.
Bake at 500 for 5 minutes then reduce the temperature to 450 and bake another 15 – 20 minutes or until a light golden brown on top. Brush with melted butter if desired.
Servings:
A gluten free recipe that makes 7 giant biscuits.
Another Damn Cooking Blog 
Thanks for the recipe and the link. I love fool proof recipes. I have wasted enough ingredients on bad recipes :).