1/2 c. mayonnaise
1/2 tsp. garlic powder
2 Tbsp. lime juice
1 tsp. salt
1/4 tsp. cayenne pepper
4 skinless boneless chicken breast halves (about 1.25 lb.)

Preheat grill or broiler. Combine mayonnaise, garlic powder, lime juice, salt and cayenne in a shallow bowl; stir well. Place chicken on grill rack. Coat well with sauce. Grill chicken for about 5 minutes; turn. Brush with remaining sauce. Broil chicken until juices run clear when meat is pierced with a knife, about 10 minutes longer.