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["Preheat the oven to 350", "Have six 14oz crocks or one 3qt casserole at hand. Trace an outline of the top of the crock or casserole on a piece of parchment paper. The template for the crocks should be cut to fit inside the crock opening with a 1/4"" margin all around.", "", "Filling: Heat the oil in a large saute pan over medium-high heat. Add the leeks, carrot, shiitakes and water chestnuts; cook for about 5 min, until the leeks begin to soften. Add the garlic, Old Bay and thyme, stirring to combine. Stir in the flour to coat the vegetables well, then add the clam juice or fish stock and the milk, stirring until smooth. Bring to a boil, then reduce the heat to medium and cook for 5-7 minutes or until the mixture thickens.", "", "Remove from the heat and stir in the seafood. Divide the mixture evenly among the individual crocks.", "", "Crust: Generously flour a work surface. Stir together the flour, baking powder, baking soda and salt in a mixing bowl. Add the parsley, dill and scallions; stir to incorporate. Use the tips of your fingers or a pastry blender to blend the chilled butter pieces into the flour mixture just until it resembles coarse meal. Add the buttermilk, stirring just until the mixture comes together and all of the flour is incorporated. Knead the dough 10-12 times. Roll the dough into a 1/2-inch-thick round. Use your parchment template to cut out circles for the crocks or the casserole shape.", "", "Use the dough cutouts to top the potpie mixture in the crocks or casserole. (Use a sharp knife to cut a 3/4"" hole at the center of the casserole.) Brush with the beaten egg. Bake for 40-45 minutes, until the crust is golden brown and the filling is bubbling."]