Preheat the oven to 375°F (190°C) and line a baking tray with parchment paper. In a large bowl, combine almond flour, oat flour, The Holly Tree Organic Psyllium Husk Whole/Powder, baking powder, and salt. Add the Greek yogurt and one egg, mixing until a soft dough forms. Divide the dough into 4 equal portions. Roll each into a rope and join the ends to form bagels. Place the bagels on the prepared tray. Brush with beaten egg and sprinkle with your preferred toppings. Bake for 25–30 minutes, or until golden brown. Cool for 10 minutes before slicing.