Grind the nuts in a blender, then add to a medium-size mixing bowl.
Process the potatoes in a food processor or use a hand grater. Lightly saute' the celery and green pepper in a few tablespoons of water.
Mix all remaining ingredients with the nuts. Add the potatoes. Let this mixture sit for 10 minutes.
Form into balls and place on a parchment paper-lined baking sheet.
Bake for 30 minutes in a preheated oven (350 degrees).
Cover with our Creamy Mushroom sauce or your favorite tomato sauce. Bake an additional 10-12 minutes, covered.
CHEF'S NOTE: You can make this recipe gluten-free if you use gluten-free bread crumbs.