01 - Line a large baking sheet with parchment paper or a silicone baking mat. Arrange graham cracker pieces in a single layer with edges touching.
02 - In a medium saucepan over medium heat, melt the butter. Add brown sugar, maple syrup, vanilla extract, and kosher salt. Bring to a gentle boil, stirring constantly, and simmer for 2–3 minutes until thickened and glossy.
03 - Pour the hot caramel mixture evenly over the graham cracker base, spreading carefully with a spatula to coat.
04 - Sprinkle the chopped toasted pecans evenly over the caramel layer. Bake in a preheated oven at 350°F (175°C) for 8–10 minutes until the caramel is bubbling.
05 - Remove from the oven and immediately scatter chocolate chips evenly across the top. Let sit for 3–4 minutes to soften, then spread the melted chocolate into a smooth, even layer using an offset spatula.
06 - Sprinkle lightly with sea salt if desired. Allow the bark to cool completely at room temperature, or refrigerate for faster setting.
07 - Once fully set, break the bark into irregular pieces. Store in an airtight container at room temperature for up to 1 week.