Disney says
Swiss, Mozzarella, and Double Crème Brie fried in a light batter, dusted with Powdered Sugar, and served with a Berry Purée, Parmesan-Garlic Pommes Frites and Cajun-spiced Remoulade.
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Friendliest.app says
The monte cristo sandwich is free of fish, shellfish, peanuts and tree nuts.

This meal contains gluten/wheat, milk, eggs and soy.

Note: Cafe Orleans can make a gluten-friendly monte cristo sandwich, but you need to make accommodations 48 hours ahead of you visit by calling Dining Information (714-781-3463).