Preheat oven to 400 degrees F. Spray an 8-inch or 9-inch square baking dish with cooking spray.
Place soup, milk, vegetables, and chicken in the prepared dish and stir until completely combined.
Top with biscuit dough.
Bake, uncovered, for 15-18 minutes, or until biscuits are golden brown and the filling is heated through and bubbly. Keep an eye on the biscuits as they’re cooking – if you think that the biscuits are getting too brown on top, just cover them very loosely with foil while you finish baking the dish.