Ingredients
- 3 tablespoons Dijon mustard
- 1 teaspoon white-wine vinegar
- 1/2 teaspoon salt
- 1/2 teaspoon black pepper
- 6 (5-oz) skinless boneless chicken breast halves
- 1 1/2 English muffins (not sandwich-size)
- 3/4 cup finely grated Parmigiano-Reggiano (1 1/2 oz)
- 1 tablespoon unsalted butter, melted
- Special equipment: parchment paper
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