Instructions

  1. In a large skillet over medium heat, sauté onion and garlic in oil for 2 minutes.
  2. Add mushrooms and cook, stirring frequently, until mushrooms are cooked down and liquid has disappeared, about 15 to 20 minutes.
  3. Let cool.
  4. Combine with rest of ingredients; form into 2 patties.
  5. Sprinkle on black pepper.
  6. Grill on both sides until heated through.
  7. Serve on whole-wheat bun.