Ingredients

• 3 cups (435 grams) white rice flour
• 1 1/2 cups (187 grams) tapioca flour
• 3/4 cup (123 grams) potato starch
• 1 tablespoon (8 grams) xanthan gum
• 1 1/2 teaspoons (5 grams) salt
• 3 tablespoons instant potato flakes
• 2 tablespoons nonfat dry milk
• 1 tablespoon sugar
• 1 packet gluten-free active dry yeast
• 1 teaspoon salt
• 2 tablespoons unsalted butter, at room temperature, plus more for greasing and brushing
• 1 cup buttermilk, at room temperature

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Instructions

1. Special equipment: Parchment paper
2. For the gluten-free flour blend: In a large bowl, whisk together the rice flour, tapioca flour, potato starch, xanthan gum and salt.
3. For the buns: In the bowl of a stand mixer fitted with the paddle attachment, mix together the potato flakes, dry milk, sugar, yeast, salt, 2 tablespoons butter and 1 3/4 cups plus 2 tablespoons gluten-free flour blend on medium-low speed. With the machine running, stream in the buttermilk and mix until the dough is combined and pulls away from the sides of the bowl.
4. Line your countertop with a large piece of parchment paper and sprinkle lightly with some of the gluten-free flour blend. Grease an 8- by 8-inch baking dish. Roll the dough out gently to about 3 inches thick. Cut the dough into 8 equal pieces and place in the prepared baking dish, evenly spaced from one another. Cover with plastic wrap and let rise until doubled in size, about 1 1/2 hours.
5. Preheat the oven to 350 degrees F. Bake the buns until golden and fluffy, about 24 minutes; remove from oven and brush with butter. Serve warm or cooled.