In a large bowl, mix together the sausage, cheddar cheese, cream cheese, and egg until just combined.
Gently fold the almond flour into the sausage mixture.
Roll the sausage mixture into balls of 1 heaping tablespoon each.
Preheat the air fryer to 400 F.
Add the sausage balls to the air fryer basket and cook for 12 minutes, turning halfway through. When done, the sausage balls should be lightly browned and have an internal temperature of at least 145 F.
Remove the balls from the air fryer basket and serve warm.