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1
FOR THE CHICKEN: Bring chicken and broth to simmer in covered. Dutch oven over medium heat. Cook until chicken is just done, 8 to 12 minutes.
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2
Transfer cooked chicken to large bowl. Pour broth through fine-mesh strainer into liquid measuring cup and reserve. Do not wash. Dutch oven.
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3
Meanwhile, adjust oven rack to upper-middle position and heat oven to 450 degrees.
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4
FOR THE TOPPING: Combine flour, baking powder, salt, black pepper, and cayenne pepper in large bowl.
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5
Sprinkle butter pieces over.top of flour. Using fingers, rub butter into flour mixture until it resembles coarse cornmeal.
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6
Stir in Parmesan. Add cream and stir until just combined.
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7
Crumble mixture into irregularly shaped pieces ranging from 1/2 to 3/4 inch each onto parchment-lined rimmed baking sheet.
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8
Bakeuntil fragrant and starting to brown, 10 to 13 minutes. Set aside.
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9
FOR THE FILLING: Heat 1 tablespoon oil in now-empty Dutch oven over medium heat until shimmering.
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10
Add onion, carrots, celery, 1/4 teaspoon salt, and 1/4 teaspoon pepper; cover and cook, stirring occasionally, until just tender, 5 to 7 minutes. While vegetables are cooking, shred chicken into small bite-size pieces.
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11
Transfer cooked vegetables to bowl with chicken; set aside.
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12
Heat remaining tablespoon oil in empty Dutch oven over medium.
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13
heat until shimmering.
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14
Add mushrooms; cover and cook, stirring occasionally, until mushrooms have released their juices, about 5 minutes.
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15
Remove cover and stir in soy sauce and tomato paste.
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16
Increase heat to medium-high and cook, stirring frequently, until liquid has evaporated, mushrooms are well browned, and dark fond begins to form on surface of pan, about 5 minutes.
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17
Transfer mushrooms to bowl with chicken and vegetables. Set aside.
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18
Heat butter in empty Dutch oven over medium heat.
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19
When foaming subsides, stir in flour and cook 1 minute. Slowly whisk in reserved chicken broth and milk.
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20
Bring to simmer, scraping pan bottom with wooden spoon to loosen browned bits, then continue to simmer until sauce fully thickens, about 1 minute.
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21
Season to taste with salt and pepper.
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22
Remove from heat and stir in lemon juice and 2 tablespoons parsley.
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23
Stir chicken-vegetable mixture and peas into sauce.
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24
Pour mixture into 13 by 9-inch baking dish or casserole dish of similar size.
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25
Scatter crumble topping evenly over filling.
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26
Bake on rimmed baking sheet until filling is bubbling and topping is well browned, 12 to 15 minutes.
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27
Sprinkle with remaining tablespoon parsley and serve.