Preheat oven to 350 degrees.
Line a baking sheet with foil and spray with cooking spray.
Tightly line up graham crackers on baking sheet.
Over medium heat melt butter.
Add in salt and brown sugar. Bring to a boil. Once boiling, stir constantly for 3 minutes.
Add pecans and cook an additional 20 seconds. Remove from heat and add in vanilla extract.
Pour onto graham crackers. Spread evenly across crackers. If too thick, watch my video to show how to correct that problem.
Bake 10 minutes.
Cool completely and then break apart. Enjoy!