Heat oil in a large pot over medium heat. Cook sausage and use a slotted spoon to transfer them to a plate. Set aside.
Saute the garlic and onion in the same pot until soft. Add the carrots and toss around for a few minutes. Add the flour and whisk everything for one minute. Gradually add chicken broth and bring mixture to a simmer and let cook for 5 minutes.
Add the cooked sausage, the tortellini and the two kinds of milk. Season with salt and pepper and simmer for 5 minutes. Add the cabbage and cook for 2-4 minutes until the cabbage is tender-crisp and the tortellini is cooked.
Recipe adapted from Life Made Simple