Bake sweet potatoes at 400 degrees F for 1 hour. Cool completely prior to peeling.

In small bowl, stir together ground flax and water. Let thicken 5 minutes to form flax egg.

In medium bowl, mash together peeled sweet potatoes, beans, flour, flax egg and spices.

Scoop up ½ cup sweet potato mixture and form into patty. Repeat to form 6 patties total.

Refrigerate 1 hour or overnight. (Note: Cold patties stay together better for cooking.)

Line air fryer basket with parchment paper. Set to air fry setting at 400 degrees F. Lay out patties in single layer (may have to cook in batches). Cook 5 minutes, flip and cook another 5 minutes.

Alternately, preheat air fryer to 375 degrees F on griddle setting. Spray one side of burgers with cooking oil and place oiled side down in air fryer. Cook 5 minutes, flip and cook another 5 minutes.