01 - Preheat oven to 350°F. Line a 13x9-inch rimmed baking sheet with parchment paper.
02 - Lay graham crackers in a single even layer across the entire bottom of the prepared baking sheet, breaking pieces as needed to fit.
03 - In a medium saucepan over medium heat, melt the butter. Stir in the brown sugar, maple syrup, and salt. Bring to a gentle boil, stirring constantly, and simmer for 2 to 3 minutes until the mixture thickens slightly.
04 - Remove the saucepan from heat and stir in the vanilla extract and chopped pecans until evenly combined.
05 - Pour the hot pecan mixture over the arranged crackers, spreading it gently and evenly with a spatula to coat every cracker.
06 - Bake for 15 to 18 minutes until the topping is bubbling and golden brown across the surface.
07 - Remove from oven and let cool for 10 minutes. If desired, drizzle melted chocolate over the warm bark in thin lines.
08 - Allow the bark to set completely at room temperature or refrigerate for faster setting. Once firm, break or cut into irregular pieces.