01 - Preheat oven to 350°F. Line a rimmed baking sheet (9x13 inches) with parchment paper or aluminum foil and lightly grease the surface.
02 - Arrange saltine crackers in a single even layer, covering the entire baking sheet with no gaps.
03 - In a medium saucepan, melt the butter over medium heat. Stir in the brown sugar, cinnamon, and salt. Bring to a rolling boil and cook, stirring frequently, for 3 minutes until the mixture thickens and becomes bubbly.
04 - Carefully pour the hot toffee mixture evenly over the arranged crackers, using a spatula to spread and coat every cracker.
05 - Bake for 8 to 10 minutes until the toffee is bubbling across the surface and turns a deep golden brown color. Remove from the oven.
06 - Immediately scatter the white chocolate chips over the hot toffee layer. Let rest for 2 minutes to soften, then spread the melted chocolate into an even layer using a spatula.
07 - In a small bowl, combine the granulated sugar and ground cinnamon. Sprinkle the cinnamon sugar mixture evenly over the melted white chocolate surface.
08 - Allow the toffee to cool completely at room temperature, then refrigerate for about 30 minutes until fully set and firm.
09 - Break the set toffee into irregular pieces by hand or cut into neat squares using a sharp knife. Serve and enjoy.