Grab a large bowl and dump in everything except the meats. Mix that all together thoroughly. ingredients into the bowl.
Add the meats. Use your hands to work it all together. Do no overwork it or you'll have golf balls for meatballs! Just mix until everything is combined.
Use ice cream scooper and make golf ball sized meatballs (or slightly smaller).
Place meatballs on your baking sheet (not touching).
Bake at 375℉ for about 20-25 minutes (until cooked through and nicely browned).
I usually get between 35-45ish meatballs, depending on their size. Eat them within a few days &/or freeze the rest for later. They reheat nicely in the oven and on the stove.