Cut the potatoes into small cubes (about 1/2-inch), put them in a large pot, and cover with water. Bring to a boil and cook until potatoes are tender.
While the potatoes are cooking, remove the center stalk from the kale and slice the leaves into strips. When the potatoes are done, lift them out with a slotted spoon and place in a large mixing bowl. Put the kale into the potato water and cook for 6 minutes or until kale is tender. Remove kale with a slotted spoon to a food processor. Add 1/4 cup of the cooking liquid and pulse to chop fine.
Preheat oven to 425 F. Mash the potatoes and add the kale and all remaining ingredients. Stir well. Using a well-rounded tablespoon, form into balls about 1 inch across. Place them on an oiled baking sheet or, preferably, a baking sheet covered with a silicone mat or parchment paper. Bake for 20 minutes. Carefully turn over and bake fore 20 minutes more, until lightly browned.
Air Fryer Instructions
How long you cook them will depend on your air fryer. Preheat it to 390F. Place the balls in a single layer in the hot basket or tray. Air fry for 8 minutes or until they are becoming crispy. Shake the basket lightly to loosen them and turn and air fry another 2-5 minutes or until lightly browned.
Nutritional data includes 2 tsp. salt. Use less to reduce sodium.