Preheat your oven to 325 degrees.
Peel and grate the onion using a cheese grater or chop it in a handy chopper until it almost turns to puree.
Place the onion in a small bowl with the oat flour and stir so that the oats can absorb some of the juice.
In a medium bowl, stir together the tomato sauce, apple cider vinegar, coconut aminos, 1/2 teaspoon of oregano, sage, and basil, and garlic and onion powders.
In a large bowl, combine the meat, onion and oat mixture, tomato paste, minced garlic, the rest of the herbs and spices, and salt. Stir together using your hands, being careful not to over mix.
Form the meatballs into approximately 1 1/2 inch balls and place beside each other in a 9 x 13 inch glass baking dish.
Pour the tomato sauce mixture evenly over the meatballs.
Place them in the oven for 50-60 minutes or until they're cooked through.
Enjoy immediately for a delicious meal.