To prepare chutney, heat 1 1/2 teaspoons oil in a small saucepan over medium heat. Add shallots and serrano; cook 2 minutes, stirring frequently. Add ginger and garlic; cook 30 seconds, stirring frequently. Add tomato, vinegar, sugar, mustard seeds, and 1/2 teaspoon salt; bring to a boil. Cover, reduce heat, and simmer 10 minutes. Uncover and simmer 5 minutes or until mixture is thick. Set aside, and keep warm.
To prepare chicken, heat 2 teaspoons oil in a small saucepan over medium heat. Add coriander, curry, cumin, and black pepper; cook 1 minute, stirring frequently. Brush mixture evenly on both sides of chicken; sprinkle evenly with 1/2 teaspoon salt.
Place chicken on grill rack coated with cooking spray; grill 4 minutes on each side or until chicken is done. Serve chutney over chicken.