Easy chicken and dumpling casserole tops a creamy chicken filling with fluffy biscuit dumplings for a simplified family classic. This protein-rich comfort food captures all the cozy flavors with a fraction of the effort.
Preheat the oven to 375°F. Lightly grease a 9x13-inch casserole dish with cooking spray or butter.
In a large bowl, mix shredded cooked chicken, frozen mixed vegetables, cream of chicken soup, milk, melted butter, thyme, garlic powder, salt, and black pepper. Spread this creamy filling evenly into the prepared casserole dish.
In a separate medium bowl, whisk together the flour and baking powder. In a small bowl, beat the egg, then add it to the flour mixture along with 1/3 cup additional milk. Stir until just combined—the dough should be thick but spoonable.
Drop spoonfuls of the biscuit mixture evenly over the chicken filling, leaving some space between each dumpling for expansion.
Bake uncovered for 40–45 minutes, until the biscuit dumplings are fluffy and golden on top and the filling is bubbling. Let rest 10 minutes before serving to set.