INGREDIENTS
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4 skinless, boneless chicken breast halves (1 to 1-1/4 pounds total)
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1/3 cup Dijon-style mustard
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3 tablespoons balsamic vinegar
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2 cloves garlic, minced
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2 teaspoons snipped fresh thyme or basil or 1/2 teaspoon dried thyme or basil, crushed
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Fresh thyme sprigs (optional)