In a medium bowl, combine 1 cup of all-purpose flour, 1 teaspoon of baking powder (if using), and a pinch of kosher salt. Stir these dry ingredients together until well mixed. Add in ¾ cup of plain Greek yogurt and mix until a crumbly dough forms.

Transfer the dough to a lightly floured surface and knead gently for about 2-3 minutes until smooth and cohesive.

Divide the kneaded dough into four equal pieces. Roll each piece into a log about 5-6 inches long, pinching the ends together to form bagels.

In a small bowl, whisk together 1 egg yolk with a teaspoon of water to make an egg wash. Brush this mixture over the shaped bagels.

Preheat your air fryer to 350°F (175°C) for about 5 minutes. Place the bagels in the basket and cook for 8-10 minutes until golden brown.

After air frying, let the bagels cool on a wire rack for 5-10 minutes before serving.