Crush up potato chips in a food processor or place them in a bag and crush them with your hands or a rolling pin. You want to keep the chunks pretty large, if they are too fine you won't get the same crunch.
In a medium bowl whisk together flour, cocoa powder, baking soda, and salt. In a large bowl beat together butter, brown sugar, and sugar until light and fluffy (2-3 minutes). Mix in egg and vanilla until blended.
Gradually mix in dry ingredients on low speed until just incorporated, don't over mix. Stir in the chocolate chips and potato chips by hand. (I reserve some for adding at the end) Cover TIGHTLY and chill for 2 hours or overnight.
Preheat oven to 350 degrees and take the dough out of the fridge while the oven is preheating.
Roll 2-3 tablespoons of cookie dough into a ball. Press a few potato chips into the top. Place cookies about 3 inches apart on a baking sheet.
Bake for 10-12 minutes until the tops of the cookies are just set. Sprinkle immediately with sea salt to taste, then allow to cool on the baking sheet for 5 minutes before transferring to a cooling rack to cool completely.