Preheat the oven to 425°F.
Coat a 9x13 ceramic baking dish with cooking spray.
Add the chicken, orzo, chicken stock, salt, and pepper, stirring until well combined.
Nestle the Boursin cheese into the middle of the dish and sprinkle the cherry tomatoes evenly over the top. Do not stir.
Cover with foil and bake for 30 minutes.
Add the spinach, and stir until everything is well combined.
Bake for an additional 5-10 minutes, or until the orzo is completely cooked through.
