Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper.
In a medium bowl, whisk together ½ cup plain Greek yogurt and 2 tablespoons maple syrup until smooth.Add the dry ingredients: 1/2 cup oat flour, 2/3 cup almond flour, 1-1/2 teaspoons baking powder, and 2 teaspoons cinnamon. Stir with a sturdy spatula until a soft, slightly sticky dough forms. The dough should hold together and pull away from the bowl, but still feel tacky.Gently fold in 1/4 cup raisins, mixing just until evenly distributed.Visual cue: The dough should be sticky but scoopable—not wet or runny. If it feels dry, add 1 tablespoon of yogurt. If it feels too wet, sprinkle in a little more flour. Lightly oil your hands, then divide the dough into 4 equal portions. Roll each portion into a smooth ball and place them on the prepared baking sheet.Press each ball down slightly, then use your finger to create a hole in the center, shaping into a bagel. Separate 1 egg, and brush the tops of the bagels lightly with the egg white to help them brown.
Bake for 15–20 minutes, until the tops are golden and the bagels feel firm when gently pressed. They should no longer feel soft or spongy in the center.
Transfer to a wire rack and let the bagels cool completely before slicing. This helps the interior finish setting so they don’t feel damp or gummy.