Ooooh, an Italian twist to halibut - yum!
Preheat oven to 400ºF. Line a 9 x 12-inch pan with aluminum foil and coat with nonstick cooking spray.
Rinse any ice glaze from frozen Alaska Halibut under cold water; pat dry with paper towel. Place halibut in pan, spacing evenly.
Combine artichoke hearts, olives, green peppers, spaghetti sauce, and 1/2 cup Parmesan cheese; blend thoroughly.
Top each halibut steak/fillet with 1/4 of vegetable mixture. Sprinkle remaining cheese over vegetables.
In preheated oven, bake frozen halibut for 20 to 25 minutes or fresh/thawed fish for 15 to 20 minutes. Cook just until fish is opaque throughout.