Finely chop the baby spinach OR shred the zucchini.
Mix all the ingredients together in a bowl except the meats: salt, pepper, Italian seasoning, paprika, nutritional yeast OR Parmesan cheese, onion and garlic powders, egg or egg replacer + avocado oil, tomato sauce, and spinach OR zucchini.
Add the ground beef and ground pork. Mix with your hands or a large fork.
Form into 1-2" meatballs, depending on your preference. Place on a baking sheet lined with parchment paper.
Bake in the preheated oven at 350 degrees for 20 minutes.
Add to a pot of the Easy From-Scratch Pasta Sauce and serve over your favorite gluten-free pasta or vegetable noodles. Top with nutritional yeast, if dairy-free, or grated Parmesan or Romano cheese.
Notes
1" meatballs yield about 50 meatballs.2" meatballs yield about 24 meatballs.My recipes will always say that onion and garlic are "optional" because I am intolerant to both. Any recipe that I make without onion and garlic are still tasty without them! However, since most people can tolerate them, I include them because they do enhance flavor.