Working in batches, pulse beef, potato, onion, green pepper, garlic, celery seeds, salt and pepper in food processor with on-and-off motion several times to chop and combine. Divide mixture in 6 equal patties.
Coat large skillet with cooking spray. Sauté patties in oil in skillet until browned and crusty, about 5 minutes per side. To serve, top the hash with a poached egg if you wish. Makes 6 servings.