1 1/4 pound ground turkey
1 egg
1/2 onion finely chopped
3 cloves garlic, minced
1/2 teaspoon salt
1/2 teaspoon freshly ground black pepper
2 tablespoons finely chopped flat lead parsley
1/2 cup Italian style bread crumbs
1/4 cup grated Parmesan cheese
2 tablespoons milk
8 ounces part-skim mozzarella cheese, cut into 1/2-inch cubes
2 tablespoons olive oil
1 (24-ounce) jar marinara sauce