Preheat oven to 400°F. Line a large rimmed baking sheet with parchment paper.
In a large mixing bowl, combine milk and breadcrumbs. Stir well and set aside.
Add the Italian sausage, ground beef, onion, garlic, eggs, salt, black pepper, Italian seasoning, parmesan cheese, and parsley to the breadcrumb and milk mixture. Use your hands to mix it together.
Roll the meatballs into 2” diameter balls. It helps to have a glass of water to dip your fingers into while you make them.
Bake for 15-20 minutes, or until the meatballs have reached an internal temperature of 165˚F. Remove from the oven then transfer the meatballs to a paper towel-lined plate to drain excess grease.
Serve over cooked noodles and sauce. Garnish with fresh parsley and enjoy immediately.