Season the chicken with salt and pepper. Sear until browned on both sides. Transfer to a plate, cool slightly, then cut into pieces.
Lightly brown the chorizo and hotdogs. Transfer to a plate.
Brown the mushrooms (skip if canned). Add potatoes, carrots, and bell peppers. Cook until lightly browned.
Lower the heat. Add butter, onion, and garlic. Cook until softened, then season with salt and pepper.
Add flour and mix well.
Pour in the broth, fish sauce, and bay leaf. Stir well, scraping the bottom of the pan.
Add the chicken, chorizo, hotdogs, cream, and peas. Stir, cover, and cook until heated through.
Transfer to a baking dish.
Roll out the pastry slightly larger than the dish. Cover the filling, trim the excess, and seal the edges. Cut slits on top and brush with egg wash.
Bake at 400°F (204°C) for about 30 minutes, until golden brown.
Let cool for about 10 minutes before serving.