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1
In a large pot, bring broth to a boil over high heat. Add potatoes, carrots, and green beans. Cover and bring to simmering; then reduce heat and cook until carrots are tender to bite, about 5 minutes. Drain, reserving broth, and set vegetables aside.
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2
Melt butter in pot over medium-high heat. Add onion, mushrooms, celery, thyme, rosemary, pepper, and salt. Saute until vegetables are soft, 7 to 10 minutes. Reduce heat to medium. Add flour and cook, stirring, until light golden, about 3 minutes. Whisk in milk until blended, then add reserved broth and whisk until no lumps remain. Cook, whisking, until simmering, 10 to 12 minutes.
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3
Remove sauce from heat and stir in reserved vegetables and the chicken. Pour into a shallow baking dish about 9 by 13 in. Let cool to room temperature, about 30 minutes.
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4
Meanwhile, preheat oven to 375u00b0. On a lightly floured work surface, roll 1 pastry sheet into a rectangle 1 in. longer and wider than baking dish. With a small knife, score a 1/2-in. border on all sides of pastry without cutting through it. Slide pastry onto a baking sheet and chill. Re-flour work surface and roll second pastry sheet to a 10- by 12-in. rectangle. Cut out 3 skulls, using a 5- by 3 1/2-in. skull-shaped cookie cutter.* Cut 4 each of large and medium bones, using 4- by 1 1/2-in. and 3 1/2- by 1 1/2-in. bone-shaped cookie cutters. Using a knife tip, score faces in skulls without cutting through pastry. Transfer skulls and bones to a baking sheet and chill until cold.
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5
Set chilled pastry rectangle onto cool chicken mixture, gently pushing it along score lines into edges of dish. Brush with egg. Arrange large bones on pastry and brush with egg; then arrange skulls and medium bones on top, overlapping a bit if needed, and brush with egg.
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6
Bake until pastry is well browned, about 40 minutes; if filling starts to bubble over, put a baking sheet on lower rack under pot pie.
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7
*We used a skull cookie cutter and dog-bone cookie cutter set from CopperGifts.com.
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8
Make ahead: Through step 4, up to 1 day, filling and pastry chilled separately airtight. To continue with step 5, bring filling to room temperature, 2 hours.
