– 1/2 yellow onion, diced – 2 carrots, peeled and diced – 4 celery stalks, diced – 3 tbsp butter, divided – 1/4 cup flour – 2 cups milk – 1/2 tsp salt – 1/2 tsp black pepper – 1 tsp Italian seasoning – 2 1/2 cups chicken stock – 1/2 can store bought biscuit dough – 2 cups cooked and chunkily shredded chicken