Preheat oven to 350 F.
Line a large baking pan with foil. Add the crackers and spread them out evenly.
Melt butter in a medium saucepan. Stir in the brown sugar and stir until dissolved. Bring to a boil, stirring constantly, and let boil for 2 minutes.
Remove pan from heat and stir in 1 1/2 teaspoons of cinnamon and all of the vanilla.
Carefully pour mixture over the crackers.
Using a spatula, gently toss and stir the crackers to get them coated completely.
Place in the oven and bake for 10 minutes.
Stir together the remaining 1 teaspoon of cinnamon, the sugar and salt.
When the crackers are done baking sprinkle them generously with the sugar mixture.
Let cool completely then break the crackers apart (some will stick together).
Store in an airtight container for up to a week.