I found this recipe at Let's Dish and altered it a bit - easy and delish.
16 oz. frozen cheese tortellini
1 tablespoon olive oil
2 boneless, skinless chicken breasts, cubed
3 green onions, chopped
2 tablespoons flour
8 ounces chicken broth
2 cups shredded parmesan cheese
Preheat oven to 350 degrees. Spray a 9x13 pan with cooking spray. Cook tortellini according to package directions leaving it slightly undercooked. In a large non-stick skillet, heat oil over medium heat. Brown the chicken for 1-2 minutes and add the green onions, cooking until chicken is done. Sprinkle flour over chicken mixture and stir to combine. Cook for 1-2 minutes. Add chicken broth and stir until thickened. Mix in sour cream until mixture is creamy and slightly thickened. Stir in tortellini. Pour chicken and tortellini mixture into the prepared pan. Sprinkle with cheese. Bake covered with foil for 30 minutes, uncover and bake for an additional 15 minutes or until bubbly and golden brown around the edges.