Ingredients
- 1/2 stick unsalted butter (1/4 cup)
- 1 medium yellow onion, thinly sliced (about 1 1/2 cups)
- 3 carrots, peeled and chopped (about 1 1/2 cups)
- 2 stalks celery, chopped (about 1 cup)
- 1 tsp. kosher salt
- 1/2 tsp. freshly ground black pepper
- 1/3 cup all purpose flour
- 2 1/2 cups lower-sodium chicken broth
- 3 cups shredded cooked chicken (from 1 rotisserie chicken) (12 oz.)
- 3/4 cup frozen sweet peas
- 2 Tbsp. chopped fresh dill
- 4 tsp. Dijon mustard
- 1 large egg
- 1 sheet frozen puff pastry (from a 17.3-oz. pkg.), thawed
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