Preheat the oven to 375 degrees Fahrenheit. Spray a 13 x 9 x 2-inch baking dish with non-stick cooking spray. Place 4 boneless skinless chicken breasts in the bottom of the dish.
In a medium bowl combine 1 cup light mayonnaise,½ cup asiago cheese,1 ½ teaspoons seasoning salt, ½ teaspoon black pepper, and 1 teaspoon garlic powder. Stir together until well mixed.
Spread the mixture evenly over each chicken piece. Sprinkle extra fresh shredded asiago cheese on the top of the chicken.