Buckwheat Gluten Free Bagels

Ingredients

• 2/3 cup buckwheat flour
• 2/3 cup millet flour
• 1/3 cup potato starch
• 1/3 cup tapioca starch
• 1/3 cup rice flour (plus more for dusting)
• 1 teaspoon xanthan gum
• 3/4 cup warm water (110-115°F)
• 1 (0.25oz) package (7g) or 2 1/4 teaspoons Red Star Active Dry Yeast
• 1 tablespoon plus 1/2 teaspoon granulated sugar, divided
• 1 large egg
• 2 tablespoons olive oil (plus more for oiling bowl)
• 2 teaspoons rice vinegar
• 1 1/2 teaspoons table salt
• 2 teaspoons baking soda (for boiling water)