01 - Whisk together gluten-free flour blend, sugar, instant yeast, and salt in a large mixing bowl until thoroughly blended.
02 - Pour warm water, vegetable oil, and apple cider vinegar into the dry mixture. Stir vigorously until a sticky, cohesive dough forms.
03 - Gently fold blueberries into the dough using a spatula, taking care to avoid crushing the berries.
04 - Lightly oil hands and shape dough into a smooth ball. Cover bowl with clean towel and place in warm area for 45 minutes until dough becomes slightly puffy.
05 - Preheat oven to 425°F. Line baking sheet with parchment paper and set aside.
06 - Dust work surface with gluten-free flour. Divide dough into 8 equal portions. Roll each piece into a ball, create a hole in center, and gently stretch to form traditional bagel shape.
07 - Bring 2 quarts water to gentle boil in large pot. Stir in honey or maple syrup if using.
08 - Carefully lower 2-3 bagels into boiling water. Cook 30 seconds per side. Remove with slotted spoon and place back on prepared baking sheet.
09 - Brush each bagel with beaten egg if desired, then sprinkle with coarse sugar.
10 - Bake at 425°F for 20-22 minutes until deep golden brown. Transfer to wire cooling rack. Allow to cool completely before slicing.