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, and salt. Bring to a gentle boil, stirring constantly, and simmer for 2 to 3 minutes until thickened and glossy.
03 - Pour the hot caramel mixture evenly over the graham cracker base, spreading carefully with a spatula to cover all pieces.
04 - Sprinkle chopped toasted pecans evenly over the caramel layer. Bake in a preheated oven at 350°F for 8 to 10 minutes until the caramel begins to bubble.
05 - Remove from the oven and immediately scatter chocolate chips evenly across the top. Let sit for 3 to 4 minutes, then spread the melted chocolate into an even layer using an offset spatula.
06 - Optionally sprinkle with sea salt. Allow to cool completely at room temperature, or refrigerate for faster setting.
07 - Once fully set, break into irregular pieces and store in an airtight container for up to one week.