Preheat browning dish according to manufacturer's directions.
Combine beef, wheat germ, walnuts, and green onion.
Shape into 2 patties.
Place patties on browning dish and cook on HI, 1 1 1/2 to 2 minutes.
Turn patties over and cook on HI, 1 1/2 to 2 minutes.
Sprinkle cheese over patties and cook on HI, 1 minute, or until cheese begins to melt.
Place patties in buns, top with avocado slices, and serve.