Line a rimmed baking sheet with parchment paper. Arrange the graham crackers in a single layer on the parchment paper.Note: Break them if necessary to completely fill the bottom of the baking sheet.
Cut butter into pieces and place in a medium saucepan with the brown sugar and salt.Bring mixture to a rolling boil stirring well to dissolve the sugar. Remove from heat. Stir in Fireball.
Sprinkle pecans evenly over graham crackers.
Pour butter mixture evenly over the graham crackers.
Bake 10 minutes. Let cool and then break into pieces.
Notes
Store in an airtight container at room temperature for 1 week.If you want it spicier, add a pinch of cayenne pepper.