In a small bowl, toss together the Mexican-style cheese and the blue cheese, then sprinkle evenly over the chicken. Top with the olives and scallions. Bake for 10 to 15 minutes, or until the cheese is melted and just starting to brown. Serve with salsa and sour cream.
Nutrition information per serving: 710 calories; 400 calories from fat (56 percent of total calories); 45 g fat (21 g saturated, 1 g trans fats); 190 mg cholesterol; 27 g carbohydrate; 3 g fiber; 4 g sugar; 51 g protein; 1560 mg sodium.