Preheat oven to 350 degrees.
In a food processor, chop or grate (depending on your attachment blades) the sweet potatoes, spinach, garlic, ginger and scallions in batches.
You want small pieces but not a puree. If you don’t have a food processor, you can grate the sweet potatoes and finely chop the remaining ingredients.
Put all meatloaf ingredients in a large bowl & mix until well combined. I think using your hands is best to get the mixture combined well… but it is pretty messy!
Put your mixture in a standard 9x5 loaf pan and bake for about an hour and 15 minutes or until the internal thermometer reads 165 degrees. If the top starts to brown too much, cover with foil and continue to bake until done. Let cool for at least 15 minutes before cutting & serving to allow juices to get absorbed back into the meat.