Pre-heat broiler on high and spray a boiler pan with non-stick cooking spray. Place fish filets on a single layer and pat dry with paper towel before drizzling with olive oil and sprinkling with salt and pepper on both sides. Broil until fish flakes easily with fork, about 3-4 minutes per side, flipping once.
In a medium bowl, toss together mango salsa ingredients. Check for seasoning and adjust accordingly. Serve broiled white fish filets with mango salsa on top or on the side.