Mushroom Pot Pie with Scallion Drop Biscuits For the filling: 2 T olive oil, divided 1 yellow onion, chopped 6 T unsalted butter 2 large carrots, chopped 1 ¾ lb. sliced mushrooms 2 stalks celery, chopped Kosher salt and ground pepper 3 cloves garlic, chopped ¼ c. all-purpose flour 2 c. vegetable stock 1 c. ...
