preheat grill to med-hi heat. After preheating, reduce one side to low.

Combine 1/4 cup green onions, 1/4 cup shallots, sugar, 2 tablespoons juice, oil, allspice, garlic, and serrano in mini food processor; process until smooth. Combine half of onion mixture and chicken in a medium bowl; toss well. Sprinkle with salt.

Place chicken on grill rack coated with cooking spray over med-hi heat. Cover and grill 5 minutes on each side. Move chicken over low heat. Cover and grill 5 minutes on each side or until done. Brush chicken with remaining onion mixture.

Combine remaining green onions, shallots, juice, cheese, cilantro, and sour cream. Halved bell peppers, lengthwise; discard seeds. Divide cheese mixture evenly among pepper halves. Place peppers on grill rack coated with cooking spray over med-hi heat. Grill 7 mins or until peppers are lightly charred.