Ingredients
Preparation
Step 2
Line a baking sheet with parchment paper. Place chilled dough on a lightly floured surface and roll out to a 12x9 1/2" rectangle, about 1/4" thick. Place on prepared sheet and cover tightly with plastic wrap. Chill. DO AHEAD: Can be made 6 hours ahead. Keep chilled.
Step 4
Remove chicken from pot and set aside until cool. Reserve broth. Shred meat; discard skin and bones. Set a large strainer over another pot. Strain broth into clean pot. Stir in tomato paste. Return to medium heat and simmer, uncovered, until reduced to 5 cups, about 40 minutes. DO AHEAD: Can be made 1 day ahead. Chill uncovered until cool. Cover chicken and broth separately; keep chilled. Rewarm broth before continuing.
Step 6
In a large heavy saucepan, melt butter over medium heat. Whisk in flour. Cook over medium-low heat, whisking constantly, until golden brown, about 10 minutes. Whisk in herbs and warm broth from chicken. Using a slotted spoon, transfer chanterelles to saucepan. Pour in soaking liquid, leaving sediment behind. Simmer for 20 minutes.
Step 7
Set a strainer over another large pot. Strain broth into pot; discard solids. Add chicken, carrots, peas, onions, mushrooms, and potatoes. Bring to a simmer. DO AHEAD: Can be made 1 day ahead. Chill uncovered until cool; cover and keep chilled. Rewarm before continuing.
Step 8
Preheat oven to 400°F. Spoon filling into an 11x8x2" or 2 1/2-quart round baking dish. (Add pie bird, if using.) Top with pastry, pinching edges to seal. If not using pie bird, cut a 1" slit in center of crust for steam to vent. Brush pastry with beaten egg, and sprinkle with sea salt and pepper, if desired.
Step 9
Place pot pie on a rimmed baking sheet. Bake until crust is golden brown and filling is bubbly, about 45 minutes.
