Halibut Olympia

Whisk olive oil dry mustard melted butter 1 tablespoon lemon juice 1 tablespoon kosher salt garlic powder red pepper flakes 1 teaspoon black pepper and 1 teaspoon dried dill in a 9x13-casserole dish.

Coat fish with seasoned olive oil mixture turning several times to coat. Cover dish with plastic wrap and refrigerate for 1 hour (up to overnight) to marinate.

Preheat oven to 350 degrees F (175 degrees C).

Mix sour cream red onion 3 tablespoons lemon juice parsley garlic 1 tablespoon kosher salt 1 teaspoon black pepper and 1 teaspoon dill in a bowl until combined.

Spread sour cream mixture over fish.

Sprinkle Cheddar cheese over sour cream mixture.

Bake in the preheated oven until the fish flakes easily with a fork about 20 minutes.

Remove fish from oven and top with French-fried onions. Return to oven and bake until onions are lightly browned about 10 more minutes.