01 - Preheat oven to 350°F. Line a 9x13 inch baking pan with aluminum foil and lightly grease the surface.
02 - Place saltine crackers in a single even layer across the bottom of the prepared pan, covering the entire surface.
03 - Melt butter in a saucepan over medium heat. Add brown sugar and stir constantly until combined. Bring to a rolling boil and cook for 3 minutes without stirring.
04 - Pour the hot toffee mixture evenly over the arranged crackers, spreading gently with a spatula to ensure full coverage.
05 - Bake for 5 minutes until the toffee is bubbling across the surface. Remove from oven.
06 - Sprinkle white chocolate chips evenly over the hot toffee. Let stand for 2 to 3 minutes until softened, then spread into a smooth even layer using a spatula.
07 - Combine granulated sugar and ground cinnamon in a small bowl. Sprinkle the mixture uniformly over the melted white chocolate layer.
08 - Allow to cool at room temperature for about 30 minutes, then refrigerate until fully set. Break into pieces or cut into squares before serving.