Preheat the oven to 120 C.
Spread the crackers out in a non stick oven proof form. My form was about 17x17 cm.
In a small saucepan over medium heat, add melted butter and brown sugar. Bring to a boil, then reduce the heat to medium low and continue to boil for 5 min.
Quickly pour the caramel over the crackers and spread to cover completely. The caramel will harden fast, so you have to be quick.
Bake for 5 min in the oven.
Remove from the oven and immediately sprinkle the chocolate chips on top.
Bake for 1 min to help the chocolate melt.
Remove from the oven and spread out the melted chocolate chips to cover completely.
Top with any additional toppings if desired. For instance crushed candy canes, sea salt, crushed nuts ...
Let harden in the fridge for about 2 h.
Break into pieces and enjoy!