In a medium bowl, whisk together the flour, baking powder, and salt.
Add the yogurt, mix well with fork until it looks like small crumbs.
Lightly dust a clean work surface with flour. Knead dough until it's smooth and not sticky. (about 20 times, the dough shouldn't stick to your hands when you pull away)
Divide dough into four equal pieces, roll each piece into a 3/4 inch thick rope. Join ends.
Brush with egg wash, and top with seasonings, if desired.
Place in air fryer, be sure not to crowd them, so bake in batches.
Bake at 300 degrees for 15 minutes.
Remove from air fryer and let cool about 15 minutes before slicing. The bagels will still be a little warm.
To store: place in a plastic bag and store in refrigerator for up to 3 days. To freeze, slice cooled bagels in half and wrap individually in plastic wrap and then in freezer safe container. To eat: thaw and pop into toaster.
To bake in oven: Preheat oven to 400 degrees. Line a baking sheet with a slipmat or parchment paper. (spray parchment with non-stick spray). Bake for 25-30 minutes. Let cool 15 minutes.