01 - Preheat oven to 350°F. Line a 9×13 inch baking pan with aluminum foil and lightly grease the surface.
02 - Lay the saltine crackers in a single even layer across the bottom of the prepared pan, covering the entire surface.
03 - In a medium saucepan, melt the butter over medium heat. Add the brown sugar and stir constantly until well combined. Bring the mixture to a rolling boil, then cook for exactly 3 minutes without stirring.
04 - Carefully pour the hot toffee mixture evenly over the arranged saltine crackers. Gently spread with a spatula to coat all crackers uniformly.
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 sit for 2–3 minutes until the chips soften, then use a spatula to spread the melted chocolate into an even layer.
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.