"Trust us on this one...."
INGREDIENTS
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1 medium yellow onion
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2 medium carrots
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2 medium stalks celery
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1 large leek
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1 large clove garlic
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8 sprigs fresh thyme, or 1 teaspoon dried thyme
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6 tablespoons (3/4 stick) unsalted butter
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1 1/2 teaspoons freshly ground black pepper, plus more for seasoning
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1/3 cup all-purpose flour
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2 cups low-sodium chicken broth
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1/2 cup heavy cream
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1 tablespoon Dijon mustard
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2 1/2 cups shredded, cooked chicken (about 12 ounces)
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1/2 cup frozen peas (do not thaw)
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2 store-bought or homemade pie crusts (at least 1 pound total), thawed if frozen but still cold
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All-purpose flour, for dusting
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1 large egg