01 - Preheat oven to 400°F (200°C). In an oven-safe skillet, combine cooked chicken, frozen mixed vegetables, cream of chicken soup, and whole milk. Stir over medium heat until thoroughly heated.
02 - Arrange refrigerated biscuit dough evenly over the warm filling in the skillet.
03 - Transfer the skillet to the oven and bake for 20 to 25 minutes, until biscuits are golden brown and filling is bubbling.