Preheat oven to 350 degrees. Line two baking sheet with parchment paper.
Add the chocolate chips and pretzels and mix until just combined. Refrigerate dough 1 hour.
Preheat oven to 350 degrees and line baking sheet with parchment paper. Scoop 2 tablespoons of dough for each ball and roll dough in a ball, gently press with the palm of your hand to slightly flatten them (just barely).
Bake 9 to 12 minutes or until cookies crack on top and are barely golden brown. Let cookies cool on the baking sheet for 5 minutes and sprinkle with salt (if desired) while cooling.