Combine mayonnaise and pesto in a bowl. Add salmon and coat evenly with the mixture. Let sit and marinate in the refrigerator for 30 minutes.

Preheat oven to 400 degrees Fahrenheit. Combine the crumb topping ingredients in a small bowl. Place marinated salmon in a 9×13-inch pan and top with the crumbs, pressing down gently. Spray with cooking spray and bake in preheated oven for 20 to 25 minutes, until salmon is done.