In a saucepan, melt 2 cups salted butter and 2 cups packed brown sugar and bring to a gentle boil
Take off the heat and add 2 tsp vanilla and 2 tsp cinnamon, then mix until combined
Add 2 bags of oyster crackers and mix until coated
Spread the mixture onto a foil-lined baking sheet and bake at 350°F for 15 minutes
While it bakes, mix together salt, sugar, and cinnamon for the coating
Let crackers cool for 2-3 minutes
While still warm (but not hot), transfer to a large bowl
Sprinkle the cinnamon sugar mix over top and toss until every piece is coated
