Ingredients

1 small tomato

1 small onion, finely chopped (1/2 cup)

2 tablespoons unsalted butter

1/8 teaspoon salt

2 large white mushrooms, finely chopped (1/4 cup)

1 tablespoon all-purpose flour

1/4 cup plus 2 tablespoons reduced-sodium chicken broth

1 1/4 cups finely chopped cooked turkey

1 tablespoon chopped fresh flat-leaf parsley

For cream puff

• 3/4 cup water
• 3/4 stick (6 tablespoons) cold unsalted butter, cut into small pieces
• 1/2 teaspoon salt
• 3/4 cup all-purpose flour, sifted after measuring
• 4 large eggs, at room temperature for 30 minutes
• 3 oz Swiss cheese, cut into 1/4-inch dice (about 3/4 cup)
• 2 tablespoons finely grated Parmigiano-Reggiano (using a Microplane rasp)
• 1/2 teaspoon dry mustard powder

Description

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