In a skillet, brown the turkey. Once completely cooked, drain and add to a 4 quart slow cooker.
Add the frozen onions, peppers, garlic, tomatoes, chicken broth & kale. Cover & cook on low for about 4 hours.
Add the milk, tortellini & Parmesan cheese, cover & cook on low for an additional hour or until the tortellini is heated through.
Serve hot topped with shredded mozzarella cheese if desired.