Pre-heat your oven to 350 degrees.
Line a baking sheet with parchment paper or silicon baking mat and arrange your graham crackers on a single layer covering the entire baking sheet.
In a small pot, melt your butter over medium heat.
Once butter is melted, add in the brown sugar.
Stir the brown sugar/butter until it begins to bubble.
Once it starts bubbling continue to stir for 2 minutes.
After the 2 minutes, remove from heat and add in your chopped pecans and vanilla extract.
Stir to combine.
Pour butter mixture over your graham crackers and spread out in a thin even layer.
Bake at 350 for 10 minutes.
Cut the crackers in manageable pieces of your choice while they are still warm.
Let cool and enjoy!
(Store in an airtight container)