INGREDIENTS
3 1/4 cups
all-purpose gluten-free flour, plus more by the tablespoon
1 1/2 tsp
xanthan gum (omit if your blend already contains it)
Scant 1/2 cup (43g) cultured buttermilk blend powder (I use Saco brand) (you can substitute 1/3 cup (43g) whey powder or the same amount dry milk powder by weight)
3 tsp
instant (breadmaker or rapid-rise) yeast
1/4 tsp
cream of tartar
1/4 tsp
baking soda
1 tbsp
packed light brown sugar
1 tsp
kosher salt
1 tsp
apple cider vinegar
2 tbsp
unsalted butter, at room temperature
2
egg whites (60 g), at room temperature
1 1/2 cups
warm water (about 95 degrees)
Baking soda bath for boiling (6 cups water + 1 tablespoon baking soda + 1 teaspoon salt)
Cornstarch wash (1 tablespoon cornstarch + 1/2 cup water mixed into a slurry) (optional – helps rolls to crisp)
Coarse salt for sprinkling