In a small bowl, combine oil, garlic, chili powder, and cayenne. Using a
rubber spatula, spread mixture over both sides of the chicken.
Prepare grill. Grill chicken until juices run clear.
Combine 1 cup of the cheese blend and the mayonnaise; mix well. Toast bread
on edge of grill, turn. Spread toasted side of the bread evenly with cheese/mayonnaise
mix. Grill, cheese side up, 2 more minutes or until cheese begins to melt.
Place a piece of chicken on toasted cheese bread and top with salsa. Sprinkle
with remaining cheese.