Ingredients

1 14- to 17-ounce Good-quality puff pastry (such as Dufour), thawed according to package instructions
1 quart Low-sodium chicken broth
1 Large yellow onion, quartered
2 Bay leaves
1 teaspoon Whole black peppercorns
3 sprigs Fresh thyme, plus 1 tablespoon chopped
4 Boneless, skinless chicken breast halves
3 tablespoons Unsalted butter
1/2 cup Peeled fresh pearl onions
2 Medium carrots, diced
1 cup Sliced white mushrooms
1 cup Fresh, or thawed frozen peas
5 tablespoons All-purpose flour
1 cup Milk
1 teaspoon Kosher salt
1/2 teaspoon Freshly ground black pepper
1 Large egg, lightly beaten

Description

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