01 - Preheat oven to 350°F (175°C). Line a rimmed baking sheet (9x13 inches) with parchment paper or aluminum foil and lightly grease the surface.
02 - Lay saltine crackers in a single even layer across the entire baking sheet, covering it completely.
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 for 3 minutes, stirring frequently, until the mixture thickens and turns bubbly.
04 - Carefully pour the hot toffee mixture evenly over the arranged crackers. Use a spatula to spread it into a uniform layer covering every cracker.
05 - Bake for 8 to 10 minutes until the toffee is bubbling across the surface and has turned a deep golden brown color. Remove from the oven.
06 - Immediately scatter the white chocolate chips over the hot toffee surface. Allow them to sit for 2 minutes to soften, then use a spatula to spread the melted chocolate into an even layer.
07 - In a small bowl, mix the granulated sugar with the cinnamon. Sprinkle this mixture evenly over the melted white chocolate while it is still warm.
08 - Let the toffee cool completely at room temperature, then transfer to the refrigerator for about 30 minutes until fully set and firm.
09 - Break the set toffee into irregular pieces or cut into neat squares using a sharp knife. Store in an airtight container at room temperature or in the refrigerator.