Indulge in this comforting chicken pot pie, brimming with tender meat and veggies in a savory cream sauce, all wrapped in flaky puff pastry.
Preheat the oven to 400°F (200°C).
Roll out one sheet of puff pastry into a 33 cm square and press it into a 9-inch pie dish. Trim excess pastry and prick it thoroughly with a fork. Line the pastry with aluminum foil and bake until golden brown, around 25 minutes. Remove foil and set aside.
In a skillet over medium-low heat, melt butter and cook onions and celery until softened and translucent, about 5 minutes. Add flour, salt, pepper, and celery seed; cook until paste-like.
Slowly whisk in milk, then gradually add broth, stirring constantly. Cook until thickened, 7 to 10 minutes. Mix in chicken and mixed vegetables; cook until veggies are thawed, 3 to 5 minutes.
Pour the chicken mixture into the pre-baked pastry shell. Roll out a second sheet of pastry into a 33 cm square, place on top of the filling, trim excess pastry, and crimp edges.
Bake until the pastry is lightly browned, about 45 to 50 minutes.
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