Place salmon skin side up on a greased cookie sheet or broiler pan.
Broil for 4-6 minutes per 1/2 inch of thickness.
Flip, broil another 4-6 minutes.
In a blender, mix the basil, garlic, and oil.
Stir in mayonnaise by hand.
Remove salmon from the oven and spread the sauce over salmon.
Sprinkle with breadcrumbs.
Return to oven and broil for 1-2 minutes. Keep an eye on it as it cooks quickly.