1. Heat a grill pan over medium-high heat. Sprinkle chicken evenly with 1/4 teaspoon salt and 1/8 teaspoon pepper. Coat pan with cooking spray. Place chicken in pan; cook 6 minutes on each side or until done.
2. Combine remaining 1/4 teaspoon salt, remaining 1/8 teaspoon pepper, shallots, and next 6 ingredients (through sugar) in a bowl, stirring well with a whisk. Serve chicken over greens with sauce.
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