01 - Bring a large pot of salted water to a boil. Cook rigatoni according to package instructions until al dente. Drain thoroughly.
02 - Combine condensed cream of chicken soup and whole milk in a large skillet. Heat over medium, stirring frequently until smooth and heated through.
03 - Stir in diced cooked chicken and fresh spinach. Cook, stirring, until chicken is heated and spinach is wilted.
04 - Add drained pasta to the skillet. Toss to coat with sauce. Serve immediately.