Preheat the Oven: Start by preheating your oven to 350°F (175°C). This ensures that your casserole bakes evenly and reaches the perfect golden brown color.
Prepare the Pineapple Mixture: In a large mixing bowl, combine the drained pineapple chunks and granulated sugar. Stir in the flour until the mixture thickens slightly, coating the pineapple evenly. This will create a rich, gooey filling.
Add the Cheese: Gently fold in the shredded sharp cheddar cheese, making sure it’s evenly distributed. The cheese will melt into the pineapple mixture, adding a creamy, savory layer to the dish.
Prepare the Cracker Topping: In a separate bowl, crush the Ritz crackers into fine crumbs. You can do this by placing them in a plastic bag and using a rolling pin, or simply crush them with your hands. Add the melted butter to the crumbs and mix well until they’re coated evenly. This buttery topping will give the casserole a satisfying crunch.
Assemble the Casserole: Pour the pineapple mixture into a greased 9x13-inch casserole dish, spreading it out evenly. Sprinkle the buttery cracker crumbs over the top, ensuring the surface is fully covered.
Bake and Enjoy: Place the casserole in the preheated oven and bake for 25 to 30 minutes, or until the top is golden brown and the casserole is bubbling around the edges. The cheese will have melted beautifully into the pineapple, creating a rich, satisfying texture.
Allow the Dish to Cool Before Serving: Give the casserole a few moments to cool slightly before serving. This not only lets the flavors blend harmoniously but also ensures a safer and more enjoyable dining experience without the risk of burning your mouth!