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 surface of the prepared baking sheet, breaking pieces as needed to fit snugly.
03 - In a medium saucepan over medium heat, melt the butter. Stir in the brown sugar, maple syrup, and salt. Bring the mixture to a gentle boil, stirring constantly, and let it simmer for 2 to 3 minutes until slightly thickened.
04 - Remove the saucepan from heat and stir in the vanilla extract and chopped pecans until evenly coated.
05 - Pour the hot pecan mixture evenly over the arranged crackers, spreading gently with a spatula to cover the entire surface.
06 - Bake for 15 to 18 minutes until the topping is bubbling and has turned a rich golden color.
07 - Remove from the oven and allow to cool for 10 minutes. If using, drizzle the melted chocolate over the warm bark in a zigzag pattern.
08 - Let the bark set completely at room temperature or refrigerate for faster setting. Once firm, break or cut into irregular pieces for serving.