Prepare macaroni and cheese according to package directions. Meanwhile, in a large skillet, cook hamburger until no longer pink; drain. Stir in salsa; set aside.
Spread macaroni into greased 9x13 baking dish. Layer with beef mixture, chips and olives; sprinkle with cheese. Bake uncovered, at 350 degrees for 15-20 minutes or until heated though. Serve with sour cream if desired.