While the pineapple drains, preheat the oven to 350°F and lightly grease a 9x9-inch dish or 2-quart casserole dish.
In a large bowl, whisk together the sugar and flour. Stir in the pineapple and cheese.
⅔ cup granulated sugar, ½ cup flour, 2 cups shredded cheddar cheese
Transfer the mixture to the prepared casserole dish. In a small bowl, combine the buttery crackers and melted butter.
2 cups crushed Ritz crackers, ¼ cup unsalted butter
Add the cracker mixture and bake for 35-40 minutes. If the crackers start to brown too quickly, cover the dish with a foil tent.
Let the casserole cool for 5-10 minutes before serving.
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Notes
*The calories listed are an approximation based on the ingredients in the recipe card and a serving size of ½ cup of casserole. Actual calories will vary.*For more information, tips, and answers to frequently asked questions, please refer to the post.*You'll need 40 ounces of canned pineapple in total.