Preheat oven to 400 degrees. Line a 9x13 baking dish with parchment paper, carefully folding the edges so you can easily lay the crackers flat.
Line baking dish with crackers.
In a medium saucepan, heat butter and brown sugar over medium heat, stirring frequently until fully combined and smooth. Do not boil, but allow it to reach 285 degrees using a candy thermometer. Pour evenly over crackers.
Bake for 8 minutes. Remove and turn off oven.
Sprinkle top with chocolate chips, then return to the warm oven (oven is off, but warm). Allow to sit for 1-2 minutes or until chocolate starts to glisten slightly. Using an offset spatula to smooth it out.
Remove, sprinkle with coarse sea salt, and allow to cool to room temperature.
Remove parchment paper and cut into squares.
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