Preheat oven to 350°.

Grease bottom and sides of casserole dish with butter.

Spread drained pineapple tidbits in even layer in casserole dish.

In medium bowl mix the flour, sugar and sharp cheddar cheese with a large plastic spoon until well blended.

Spread flour mixture in an even layer on top of pineapple in casserole dish.

Spread crushed Ritz Crackers evenly on top of flour mixture.

Spoon or drizzle melted butter over crushed crackers.

Place in preheated oven and bake for 30 to 45 minutes.