Heat oven to 325 degrees F. Mix cream cheese, mozzarella, parmesan, and chopped spinach together. Grab a piece of chicken and place about 2 heaping Tablespoons of the cheese/spinach mixture. Continue until all chicken breast are done. Then take 2 slices of ham per chicken and place on top. Grab a baking dish and lightly spray with cooking spray. Roll up each chicken tightly and place a toothpick in. Place beaten egg in a bowl and the panko crumbs on a plate. Dip chicken in the beaten egg and then roll in panko bread crumbs. Place in a baking dish seam side down. Bake for 40 minutes or until chicken is done. Remove from oven and throw away toothpick. If you want you can serve with spaghetti sauce over top and sprinkle with more mozzarella.