Sweet watermelon perfectly complements the earthy spices—oregano, chili powder, and cumin— used to marinate juicy chicken breasts.
Combine first 6 ingredients in a large zip-top plastic bag. Add chicken to bag; seal. Marinate in refrigerator up to 4 hours, turning bag occasionally.
Place chicken on a grill rack coated with cooking spray. Grill 5 minutes on each side or until done. Combine watermelon and remaining ingredients. Serve watermelon mixture with chicken.
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