Prepare your baking dish with cooking spray or butter and preheat oven to 350 degrees F.
Drain the pineapple chunks, reserving 1/3 cup of the juice. Drain the crushed pineapple too. (I like using a colander for this step, making sure all the pineapple is well-drained.) Once drained, transfer the pineapple and reserved juice to a large bowl. Add sugar, flour and cheese and mix until well-combined. Transfer pineapple-cheese mixture to the prepared baking dish.
2 (20 oz.) cans pineapple chunks in 100% pineapple juice, 1 (20 oz.) can crushed pineapple, 2/3 cup granulated sugar, 1/2 cup all-purpose flour, 8 oz. cheddar cheese, shredded
Add Ritz crackers to the bowl of a food processor and pulse until they pulverized into crumbs. Add melted butter to the food processor and pulse until combined.
2 sleeves Ritz Crackers, 1/2 cup butter,
Sprinkle cracker mixture on top of the pineapple mixture until it is completely covered.
Bake for 35-40 minutes, or until slightly golden on top and bubbling around the edges, Serve warm.