Preheat oven to 375°F. Line a baking sheet with tin foil and spray lightly with cooking spray.

Mix the bread crumbs, milk and eggs together in a large bowl. Add the onion, garlic, cheese, herbs, salt, and pepper. Stir until well combined. Let the mixture sit for five minutes or so before starting the next step.

Remove the ground beef and sausage from their packaging. Break off pieces of each and add them to the bowl. Once all of the meat is added, combine it with the bread crumb mixture. Use your hands and gently press the meat into the breadcrumb mixture. Turn it in the bowl and press again, sort of how you might knead bread dough. Once the breadcrumb mixture is absorbed into the meat form golf ball-sized meatballs and place them on the baking sheet.

Bake the meatballs for 30-40 minutes or until cooked through and no longer pink inside.