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Coat bottom of a 13x9" baking dish with half of the olive oil.
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Cut mushrooms into halves and place in dish.
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Cut onions into rings and spread them over mushrooms.
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Give the contents of pan a good sprinkle of cajun seasoning.
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Top with the fillets in a single layer (some overlap won't hurt).
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Drizzle them with remaining oil and give the whole thing another shake of cajun spice.
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Bake in 400 degree oven 15-20 minutes or until bubbly.
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I usually use a little more olive oil because the juice is great for dipping.