Cut chicken into smaller/thinner pieces for cooking.
Melt butter in a large frying pan. Add the chicken and sprinkle with salt. Cook the pasta.
Add all the veggies. Cook and stir until the chicken and veggies are done. If the chicken begins to brown (which is good), add a little extra butter and scrape the browned bits off the bottom of the pan. Chop the chicken up into bite-sized pieces as it is cooking.
Scoop the chicken mixture over cooked, drained pasta. Top with the slices of cheese. Serve immediately.