In a large bowl, combine the pineapple, flour, sugar, and cheese. Transfer the mixture to a 9x9 or 10x10-inch baking dish. A 9 or 10-inch pie dish may also be used.
In a medium bowl, mix together the melted butter and crushed crackers until evenly coated.
Sprinkle the crackers over the top of the pineapple mixture and bake for 30 minutes. Serve warm.
Notes
Granulated sugar may be used instead of light brown sugar.
Other butter crackers may be used instead of Ritz, you should have about 1 1/2 to 2 cups of crushed crackers.
For a larger crowd, double the recipe and bake in a 9x13-inch pan.