Preheat the oven to 350°F (175°C). Line a baking sheet with parchment paper.
Lay the graham crackers out on the prepared baking sheet in a single layer, breaking them if necessary to fit.
In a medium saucepan over medium heat, melt the butter and brown sugar together, stirring constantly until the mixture is smooth and starts to bubble (about 2-3 minutes).
Remove from heat and stir in the vanilla extract, ground cinnamon, and salt until well combined.
Pour the butter mixture evenly over the graham crackers, spreading it out with a spatula to coat them completely.
Bake in the preheated oven for 10-12 minutes until bubbly and golden. Remove from the oven and let cool for a couple of minutes.
In a small bowl, mix the powdered sugar with the milk until smooth. If it’s too thick, add more milk a teaspoon at a time until desired drizzling consistency is achieved.
Drizzle the powdered sugar mixture over the cooled cracker candy, allowing it to set for a few minutes.
Once set, break the candy into pieces and enjoy!
Notes
Allow the candy to cool completely before breaking into pieces for best results.