01 -
Preheat the oven to 375°F. Line a rimmed baking sheet with parchment paper. Arrange the saltine crackers in a single layer so they touch but do not overlap.
02 -
Melt the butter and brown sugar in a small saucepan over medium heat. Bring to a full rolling boil and cook for exactly 3 minutes, stirring constantly. The mixture should thicken and look like thin caramel. Immediately pour over the crackers and spread to the edges.
03 -
Bake for 5 to 6 minutes until the toffee is bubbling all over and deep golden. Watch closely so the edges do not burn.
04 -
Remove from the oven and sprinkle the chocolate chips evenly on top. Let sit for 2 to 3 minutes until glossy, then spread into an even layer with an offset spatula or butter knife.
05 -
Add any desired toppings while the chocolate is still wet. Refrigerate for 1 to 2 hours until fully hard. Lift the parchment from the pan and break or cut into pieces.