Preheat the oven to 400F.
Combine chicken, vegetables, soup, water, salt and pepper in a in a large bowl. Stir until well combined.
Transfer the mixture to a large casserole dish. Cover with foil and bake at 400F until bubbling (about 30 minutes).
With 15 minutes left, place biscuits on a greased baking sheet and bake at 400F for the remaining 15 minutes.
Sprinkle the casserole with cheese and top with biscuits to serve.