Preheat oven to 350°F.
Mix cracker crumbs, melted butter, cheese, parsley and garlic salt in a small bowl until well blended.
Fill mushroom caps with cracker mixture creating a small mound. Place filled mushrooms in an 8×8-inch baking pan.
Add water to pan to just cover the bottom.
Cover with foil and bake for 15 minutes.
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