Preheat the oven to 425 degrees F.
Saute the chopped onion in olive oil over a medium to low heat. When the onions are beginning to turn clear, add a couple of shakes of soy sauce, the ginger and the garlic. Cook for an additional 2 - 3 minutes. Turn off the heat and add in the nutritional yeast, stir. Combine all ingredients in a bowl and mix well. This recipe would work well with alternative spices, or vegetables. Feel free to increase the spinach amount as well, I just added it for a little extra colour.
Place in a lightly greased loaf pan, cover with foil and bake for15 minutes. Remove the foil and bake additionally to brown the top.
You could also probably prepare this and bake it later or the next day, in which case you would bake it for longer. Also, I know some people like a tomato concoction with their meatloaf; feel free to add one. I definitely recommend serving gravy with it, it really seems to complete the dish.