Response:  1. Portobello mushroom - 20 calories
  2. Onion - 8 calories
  3. Spinach - 7 calories
  4. Whole wheat bun - 156 calories
  5. Beyond Meat patty - 230 calories
  6. Cheddar cheese - 113 calories
  7. Olive oil (for sauteeing mushrooms and onions) - 120 calories
  
  **Total Calories:** 654 calories