Cook the rainbow pasta according to the package instructions, drain it, and let it cool down.
Cut the cherry tomatoes in half and add them to the pasta.
Add the corn and chopped celery to the pasta.
Chop the leftover chicken breasts and add them to the pasta.
Cut the avocado into small pieces and add them to the pasta.
Cut the pineapple into small pieces and add them to the pasta.
In a separate bowl, mix together the yogurt, mayo, and mustard.
Pour the yogurt mixture over the pasta and mix everything together.
Pack the pasta salad in a Tupperware container and enjoy for lunch.
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