Cheesy Baked Fish
Ingredients:
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3 tablespoons butter
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1 onion, thinly sliced
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1 pound skin-on fresh cod
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1 tablespoon seasoned salt, or more to taste
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½ cup mayonnaise
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2 ½ tablespoons grated Parmesan cheese
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2 ½ tablespoons shredded provolone cheese
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2 ½ tablespoons shredded mozzarella cheese
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1 tablespoon chopped fresh parsley