Get Cooking: Fire up your oven to 400°F (200°C) and lightly brush a baking dish with olive oil.
Whip up the Crust: Take a bowl, throw in Parmesan cheese, diced artichoke hearts, mayo, sour cream, lemon juice, garlic, and parsley. Stir it up good. Add some salt and pepper for flavour.
Time for Tilapia: Put the tilapia in the baking dish and add a pinch of salt and pepper to each side.
Cover the Fish: Spread the Parmesan-artichoke mix evenly on each fillet. You want the fish fully covered.
Oven Time: Pop the dish in the preheated oven for 15–20 minutes. You'll know it's done when the fish flakes off easy and the topping is golden brown and bubbly.
Dish it Up: Sprinkle extra parsley if that's your thing, and enjoy it while it's hot.