Cheesy Baked Fish - cooking recipe

Ingredients

3 tablespoons butter
1 onion, thinly sliced
1 pound skin-on fresh cod
1 tablespoon seasoned salt, or more to taste
1/2 cup mayonnaise
2 1/2 tablespoons grated Parmesan cheese
2 1/2 tablespoons shredded provolone cheese
2 1/2 tablespoons shredded mozzarella cheese
1 tablespoon chopped fresh parsley

Preparation

Preheat oven to 400 degrees F (200 degrees C). Place butter in a 9x13-inch casserole dish.
Place casserole dish in the preheating oven until butter is melted, about 5 minutes.
Spread onion slices in the bottom of the casserole dish. Place cod skin-side down over onion. Sprinkle seasoned salt evenly on top.
Mix mayonnaise, Parmesan cheese, provolone cheese, mozzarella cheese, and fresh parsley together in a bowl. Spread over cod.
Bake in the preheated oven until cod flakes easily with a fork, 20 to 25 minutes.