Add frozen vegetables, tortellini and sausage to a large skillet with a lid. Add in ½ cup of water. Heat on high heat until water is boiling, then reduce heat to medium, cover and let simmer for 10 minutes. Then remove lid, add in sauce packet, increase heat to medium-high. Cook, stirring continuously until sauce is no longer watery, and coats the veggies and pasta like a creamy sauce. Serve immediately.