01 - Preheat oven to 350°F. Line a 9x13 inch baking pan with aluminum foil and lightly grease the surface.
02 - Place the saltine crackers in a single even layer across the bottom of the prepared pan, covering any gaps.
03 - Melt the butter in a saucepan over medium heat. Add the brown sugar and stir constantly until combined. Bring the mixture to a rolling boil, then cook for exactly 3 minutes without stirring.
04 - Pour the hot toffee mixture evenly over the arranged crackers. Use a spatula to gently spread it into an even layer, ensuring all crackers are covered.
05 - Bake for 5 minutes, or until the toffee layer is bubbling across the entire surface.
06 - Remove the pan from the oven and immediately sprinkle the white chocolate chips over the hot toffee. Let stand for 2 to 3 minutes until the chips soften, then spread into a smooth, even layer using a spatula.
07 - In a small bowl, combine the granulated sugar and ground cinnamon. Sprinkle the mixture evenly over the melted white chocolate layer.
08 - Allow the toffee to cool at room temperature for about 30 minutes, then refrigerate until fully set. Once firm, break into pieces or cut into 24 squares.