Bring a pot of lightly salted water to a boil. Cook pasta according to package directions, and drain.
Meanwhile, spray a large skillet with cooking spray and heat over medium high heat. Add diced chicken, sprinkle with salt, and stir fry until cooked through. Add tomatoes, and bring to a simmer.
Stir in cooked pasta, cubed cheese, and green onions, leaving a few pinches of green onions for garnish. Heat and stir until cheese is melted. Allow to stand off heat for 5-10 minutes to allow sauce to thicken. Serve topped with remaining green onions.