Preheat the oven to 350 degrees.
Line a rimmed baking sheet with foil for easy clean up. Set aside.
Place the bread crumbs and milk in a medium bowl; stir to combine. Set aside.
Put the two meats in a large bowl, breaking apart as you add them.
While the bread crumbs are soaking, grate the onion and garlic and add to the meat.
Add the eggs, salt, pepper, oregano, thyme, rosemary, basil, and soaked bread crumbs to the meat mixture and combine thoroughly, but gently.
Make a small patty of this meat mixture, about 1 tablespoon, and saute it in a small nonstick pan. Taste it once it has cooled and see if you need to add more salt, pepper, or any other seasoning. Once you’ve adjusted the seasoning, you can make another patty and taste again.
Once you’re happy with your meatball mixture, use a #12 disher/cookie scoop (2.7 fl oz) or ¼ cup measuring cup and shape the meatballs, placing them on the lined baking sheet, about ½ in apart. Be sure they are not touching, you need the airflow in between them. Of course, you can shape the meatballs smaller, more like golf ball size, if you’d prefer. Just adjust your cook time. Using a digital thermometer ensures the best cooking results.
Bake the meatballs for approximately 25 to 30 minutes. Your cook time is determined by the size of your meatballs and the heating of your oven. Check for doneness with a digital thermometer, reading 165 degrees.
While meatballs are cooking, heat your jarred marinara or begin making your homemade sauce.
Remove from the oven and add them to your warm marinara sauce. Sprinkle with parsley. Serve over spaghetti or by themselves.