First, preheat the oven to 350℉
Next in a bowl, add the shredded cheese, sugar, pineapple juice and mix it together with the flour. This will not be perfect.
Then, add in the drained pineapple and add the mix into a 8x8 baking dish. Bake for 30 minutes.
While the pineapple cheese casserole is baking, crush ritz crackers and toss with melted butter in a large bag or bowl.
At 30 minutes, remove the casserole from the oven and carefully mix with a spoon. Then, add the buttered ritz crackers on top.
Bake a remaining 15-20 minutes or until top is golden brown. Remove the casserole from the oven.
Allow to cool before serving.