01 - Whisk together gluten-free flour blend, sugar, instant yeast, and salt in a large mixing bowl until thoroughly combined.
02 - Pour warm water, vegetable oil, and apple cider vinegar into dry ingredients. Mix thoroughly until a sticky, uniform dough forms.
03 - Gently fold blueberries into the dough, taking care not to crush or burst the berries.
04 - Lightly oil hands and shape dough into a ball. Cover bowl with clean towel and let rise in warm area for 45 minutes until slightly puffy.
05 - Preheat oven to 425°F and line baking sheet with parchment paper.
06 - Dust work surface with gluten-free flour. Divide dough into 8 equal portions.
07 - Roll each portion into a smooth ball, create hole in center, and gently stretch to form bagel shape. Arrange on prepared baking sheet.
08 - Bring 2 quarts water to gentle boil in large pot. Stir in honey or maple syrup if using.
09 - Carefully lower 2-3 bagels into boiling water. Boil 30 seconds per side. Remove with slotted spoon and return to baking sheet.
10 - Brush each bagel with beaten egg and sprinkle with coarse sugar if desired.
11 - Bake for 20-22 minutes until golden brown. Cool on wire rack before serving.