Preheat your oven to 350°F.
In a mixing bowl, combine drained pineapple chunks, crushed pineapple, sweetener, 1 cup of shredded cheddar cheese, cornstarch, a pinch of cinnamon and season with salt to taste
Mix the ingredients thoroughly until well combined.
Transfer the mixture to a baking dish coated with cooking spray
In a separate bowl combine the melted margarine, crushed whole wheat crackers, ¼ cup of the reserved pineapple juice, ¼ cup of shredded cheese, and additional zero-point sweetener and salt to taste.
Top the filled baking dish with your cracker crumble.
Bake for 25-35 minutes or until the casserole is golden brown and bubbly.
Allow it to cool for a few minutes before serving.