Add avocado, egg, and cheese into a medium bowl. Mash with a fork and mix until well combined.
Oven: Preheat oven to 400ºF. Line a sheet pan with parchment paper. Divide the mixture into 2-3 balls and transfer onto parchment paper. Use your spoon to form a patty shape. Sprinkle with everything bagel seasoning or salt if desired. Bake for 20 minutes or until golden.
Air Fryer: Pre-heat the air fryer to 400ºF. Line the air fryer basket with parchment paper. Divide the mixture into 4 balls and transfer onto parchment paper. Use your spoon to form a patty shape.
Sprinkle with everything bagel seasoning or salt if desired. Bake for 20 minutes or until golden.
