1. To prepare chicken, combine first 4 ingredients in a large bowl; toss and let stand 3 minutes. Remove chicken from marinade; discard marinade. Sprinkle chicken evenly with 1/4 teaspoon salt. Heat a grill pan over medium-high heat. Coat pan with cooking spray. Add chicken to pan; cook 6 minutes on each side or until done.
2. To prepare salsa, combine tomato and next 4 ingredients (through pepper) in a medium bowl. Add avocado; stir gently to combine. Serve salsa over chicken.
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