This chicken, spinach, and pasta salad is dressed with a flavorful mayonnaise and lemon juice dressing. This is a great main dish salad for hot summer days. Use cooked leftover chicken, canned chicken, or a rotisserie chicken for this tasty salad recipe. The recipe is very forgiving, so feel free to change some of the ingredients to suit your taste. Spinach can be replaced with arugula or baby kale, and the onion can be omitted if you aren't a fan. Use turkey or ham instead or chicken.