Tender Gluten-Free Scones with Almond Flour

Make the Scone Dough
1 In a large bowl, combine the sweet rice, almond, oat, and tapioca flours with the ¼ cup sugar, baking powder, and salt. Whisk to combine.
9 Add the butter slices (and citrus zest, if you're using any). Blend with a pastry cutter or your fingertips until the butter is broken down into the size of small peas. 
10 If you're using fresh or dried fruit, toss them in at this time. Pop the flour mixture in the fridge for 10 minutes or longer to cool the butter back down.
0 Whisk together the 6 tablespoons cream, egg, and vanilla (if using) in a measuring pitcher. Chill until needed.
2 Remove the flour mixture from the refrigerator. (If you're using frozen fruit, toss it in now.) Gradually add the cream mixture, working with a flexible silicone spatula until the dough holds together when you give it a squeeze. If the dough is too dry, add a few drops of cold cream directly to the floury bits. 
Shape the Scones
3 Gently but firmly press the dough together with your hands and shape it into a rough ball. Place on a piece of beeswax wrap or plastic wrap and form it into a disk that measures 6 inches across and about 1 ¼ inches high. Don't worry about overworking the dough since there isn't any gluten to toughen here!
4 Wrap and chill the dough disk until firm, at least 30 minutes and up to overnight.
Bake the scones
5 When ready to bake, position a rack in the uppermost spot of your oven and preheat to 425ºF. Stack a rimmed baking sheet atop a second rimmed baking sheet and line with parchment paper. This will all keep the scones' bottoms from over-browning. 
6 Remove the dough round from the refrigerator, unwrap and place on a cutting board dusted lightly with oat flour. Brush the top of the scone with a little cream and sprinkle lightly with sugar. Use a large, sharp chef’s knife to cut the scone into 8 wedges and place the wedges on the prepared baking sheet, spaced well apart.
7 Bake the scones until golden on top and cooked through, 20–25 minutes, rotating the pan after 15 minutes to brown them evenly. 
8 Remove from the oven and transfer the scones to a wire rack. Let cool until warm, 10-20 minutes; they are still baking from residual heat. Serve warm or at room temperature.