Easy Meatball Recipe

1 pound lean ground beef 1 pound lean ground pork (or additional ground beef) ½ cup Italian seasoned breadcrumbs ⅓ cup milk ¼ cup onion, diced ¼ cup fresh parsley, chopped (or 1 tablespoon dried parsley) ¼ cup Parmesan cheese, grated 1 large egg 1 teaspoon Italian seasoning ½ teaspoon garlic powder ½ teaspoon each salt and pepper (more to taste)