Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper or a silicone baking mat.
In a medium bowl, stir together the wet ingredients: ½ cup Greek yogurt, 2 tablespoons maple syrup, 1 teaspoon vanilla extract, and ⅛ teaspoon almond extract, until smooth.Add the dry ingredients: ½ cup oat flour, ¼ cup gluten-free flour, 1 teaspoon baking powder, and ¼ teaspoon salt. Stir until a dough forms. The dough should feel slightly tacky but easy to handle. Gently fold in ¼ cup blueberries. Stir just enough to distribute them—overmixing will release too much juice and make the dough harder to shape.
Divide the dough into 4 equal portions. Lightly oil your hands to prevent sticking, then roll each portion into a ball and gently flatten it on the baking sheet. Use your thumb to press a hole through the center of each one to form a bagel shape.
If using an egg wash, separate the egg white from the yolk and lightly brush the tops of the bagels with the egg white.
Bake for 24–27 minutes, or until the tops are lightly golden and the bagels feel set when touched.Let the bagels cool on a wire rack for a few minutes before slicing. They can be enjoyed warm or at room temperature.