Chicken Pot Pie with Mushrooms and Thyme

Preheat an oven to 400°F (200°C). Line a baking sheet with parchment paper.

To make the filling, in a 5-quart Dutch oven over medium heat, melt the butter. Add the flour and cook, stirring constantly, until the mixture smells fragrant and nutty, about 2 minutes. Whisk in the Madeira and demi-glace. Slowly add the chicken stock, whisking until smooth, and bring to a boil. Add the diced onion, celery, mushrooms, thyme, tarragon and bay leaf and cook until the vegetables are almost tender, about 10 minutes. Add the potatoes, chicken and pearl onions and season with salt and pepper. Cook until the potatoes are tender, about 10 minutes. Remove from the heat and let cool for 10 minutes. Remove the bay leaf and discard.

To assemble the pot pie, on a dry work surface, gently unroll the phyllo. Cut the phyllo in half horizontally. Cover half of the phyllo with a slightly damp paper towel and set aside.

Spread 1 phyllo sheet from the second stack on your work surface and, using a pastry brush, lightly brush with melted butter. Cover with a second sheet, rotating it clockwise slightly, and brush it with more butter. Repeat with the remaining sheets from the second stack, rotating each one slightly and brushing each with butter. Carefully lift the stack of buttered phyllo and place it on top of the pot pie, folding the dough up as necessary along the edges of the pot. Brush the phyllo with the egg wash and sprinkle with sea salt.

Bake until the phyllo is crisp and browned all over, 15 to 20 minutes, covering the edges with aluminum foil about halfway through the cooking time if necessary to keep it from turning too brown. Remove from the oven and let cool about 10 minutes before serving.

While the pot pie is cooking, prepare the remaining phyllo. Spread 1 of the remaining phyllo sheets on your work surface and, using a pastry brush, lightly brush with melted butter. Cover with a second sheet and brush it with butter. Repeat with the remaining sheets of phyllo, brushing each with butter. Using a sharp knife, cut the sheet of phyllo into 8 triangles of equal size. Transfer the triangles to the prepared baking sheet.

While the pot pie is cooling, place the phyllo triangles in the oven and bake until lightly browned and crispy, 8 to 10 minutes.

To serve, spoon the pot pie onto warmed plates or shallow bowls and arrange a phyllo triangle on top of each serving. Serves 8.

Williams Sonoma Test Kitchen