Season and brown chicken in skillet with oil. No need to cook thoroughly.
Prepare cheese mix - combine all ingredients of cheese mix and stir until blended together.
In a baking dish, layer spinach on bottom. Spoon cheese mixture over top. Then add chicken thighs. Sprinkle with some Mozzarella and Parmesan cheese on top.
Bake in preheated oven at 350 for 45 minutes