Add chopped tomatoes to the remaining chicken and cook for 3 minutes on high until tomatoes release their juices. Next add the fresh spinach in 4 batches until each batch wilts.
Once the spinach is wilted, add the half and half to the pan and bring mixture to a boil. Reduce to a simmer and slowly add grated Parmesan cheese until the cheese melts and makes the sauce creamy. Remove from heat.
I used ziti pasta instead.