1Mix self-rising flour and Greek yogurt until a smooth, homogeneous dough forms.
2Grease a small cake pan with non-stick spray or line a grill tray with parchment paper.
3Take a heaping tablespoon of dough, form into balls, and place in the pan, leaving space between them (about 7 balls fit).
4If desired, sprinkle cinnamon sugar or everything bagel seasoning on top.
5Close the air fryer lid, set temperature to 163°C (325°F), and cook for 5 minutes for small balls, or 9 minutes for larger balls (bagel-shaped).
6Flip the balls and cook for another 4 minutes at the same temperature (6 minutes for larger version).
7Remove and let cool completely before filling with cream cheese, if using.
8To fill: make a small slit on the side of each bagel bite and, using a piping bag or a ziplock bag with a cut corner, pipe softened cream cheese inside.