Line a 15x10x1 inch baking sheet with foil or parchment paper lightly sprayed with non stick cooking spray.
Break graham crackers into quarters and cover the baking sheet in a single layer.
In a saucepan over medium heat, combine the butter and brown sugar. Bring to a boil, stirring constantly, for about 3 minutes.
Remove from heat and pour evenly the graham crackers. You may need to spread mixture evenly over graham crackers with a spoon.
Bake for 7 minutes.
Remove from oven and sprinkle chocolate chips over the baked toffee and let them melt for a few minutes. Spread melted chocolate evenly over the toffee.
Sprinkle chopped pecans on top of the melted chocolate.
Cool completely (put in fridge to set up faster) and break into pieces to serve.
Notes
Let the Graham Cracker Toffee cool completely and then break it into pieces to serve. If you are short on time, place the baking sheet in the fridge to hep the chocolate set up faster.