This recipe is (PC).
1 cup fresh bread crumbs
½ cup whole milk
1 lb ground beef
½ lb ground pork
½ lb Italian sausage, casings removed
1 small yellow onion, finely chopped
3 cloves garlic, finely chopped
Kosher salt
Black pepper
2 large eggs, beaten to blend
1 cup finely grated Parmesan, plus more for serving
¼ cup chopped fresh parsley, plus more for serving
2 tbsp extra-virgin olive oil
1 (32-oz) jar or homemade marinara sauce
In a small bowl, mix bread crumbs and milk until combined. Let sit for 15 minutes.
In a large bowl, using your hands, combine beef, pork, sausage, onion, and garlic; season with salt and pepper.
Gently stir in bread crumb mixture, eggs, Parmesan, and parsley until just combined. Form beef mixture into 1 ½" balls.
In a large, high-sided skillet over medium heat, heat oil. Working in batches, sear meatballs on all sides to develop a crust, about 2 minutes per side. Transfer to a large bowl or plate.
In the same skillet over medium-low heat, bring sauce to a simmer, then return meatballs to skillet. Cover and simmer until meatballs are cooked through, about 8 minutes more.
Top meatballs with more Parmesan and parsley.
Serve.