Grease and line a 13-by-9-inch baking sheet with parchment paper.
Overhang parchment paper on short ends of baking sheet.
Break the graham crackers on the perforated lines into smaller rectangles.
Place them on the baking sheet as close together as possible, cover the entire sheet.
Melt butter and sugar in a saucepot over medium heat.
Stir the butter and sugar mixture until it bubbles.
Add pecans and stir together.
Pour the mixture evenly over all of the crackers.
Bake in a preheated 350-degree oven for 10 minutes.
Cool for 30 minutes.
Break or cut into pieces to serve.