INGREDIENTS
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1 tablespoon plus 1 teaspoon whole-grain Dijon mustard, divided
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1 tablespoon olive oil
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1 teaspoon chopped fresh rosemary
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1/4 teaspoon salt
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1/4 teaspoon black pepper
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4 (6-ounce) skinless, boneless chicken breast halves
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Cooking spray
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3 tablespoons light mayonnaise
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1 tablespoon water
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Rosemary sprigs (optional)