Preheat your oven to 180° C (350° F), get out a 7x11 inch baking pan.
Heat the butter in a large non stick pan, when hot, add the onion, celery, and mushrooms. Sauté until tender.
Stir in the flour.
Stir in the broth and cream all at once, cook and stir until mixture comes to a boil.
Stir in the ham, chicken, and seasonings. Heat through.
Pour mixture into the baking pan.
Top the hot mixture with yam biscuits, follow the Shortcut for that recipe.
Bake for 30-35 minutes or until biscuits are done.
Serve with sides of your choice, enjoy.