01 - Preheat oven to 350°F. Line a 13x9-inch rimmed baking sheet with parchment paper.
02 - Arrange graham crackers in a single layer to completely cover the bottom of the baking sheet.
03 - In a saucepan over medium heat, melt the butter. Stir in the brown sugar, maple syrup, and salt. Bring to a gentle boil, stirring constantly. Simmer for 2 to 3 minutes until the mixture slightly thickens.
04 - Remove the saucepan from heat and stir in the vanilla extract and chopped pecans until evenly coated.
05 - Carefully pour the hot pecan mixture evenly over the graham crackers, spreading gently with a spatula to cover the entire surface.
06 - Bake for 15 to 18 minutes until the topping is bubbling and golden brown.
07 - Remove from oven and let cool for 10 minutes. If desired, drizzle melted chocolate over the warm bark.
08 - Allow the bark to set completely. Refrigerate for faster setting, then break or cut into serving pieces.