Begin by preheating the oven to 400 degrees and lining a sheet pan with parchment paper.
Prepare the Caper Tartar Sauce. In a small bowl, stir together all ingredients. Store in refrigerator for flavors to meld and sauce to chill while you prepare the dish.
Next prepare the cornflake crust by combining the crushed cornflakes, chives, salt, pepper, scallions and olive oil in a small bowl.
Dry the fish filets well with paper towels and season liberally on all sides with salt and pepper. Drizzle sheet pan with olive oil and add each fish filet, spaced out. To each filet, add 1/2 teaspoon of tartar sauce to each, spreading all across the fish. This will help your cornflake crust adhere. Chill remaining tartar sauce while fish is cooking.
To each filet, divide the cornflake crust and pat down gently atop the tartar sauce until each filet is covered. Drizzle fish filets with olive oil and bake on the top rack for 8-10 minutes, depending on thickness, until fish is white and moist and just flakes apart.
Serve fish atop a couple spoonfuls of tartar sauce alongside rice and a simple salad.