- Preheat the oven to 350°F [180°C]. Line a rimmed baking sheet with parchment paper.
- In a medium bowl, combine the flour, baking soda, and salt and whisk together. Add the butterscotch chips and set aside. In the bowl of a stand mixer fitted with the paddle attachment, cream the melted butter and sugars on medium-high speed until thick, light, and glossy, 3 to 5 minutes, scraping the bowl with a rubber spatula as needed.
- Decrease the mixer speed to medium-low and add the egg and yolk, one at a time, beating well and scraping the bowl after each addition with a rubber spatula. Add the vanilla and mix to combine. Add the dry ingredients all at once, mixing just to combine. Remove the bowl from the stand mixer and add 3 cups [105 g] of the potato chips to the dough, combining and crushing the chips with a rubber spatula.
- In a small bowl, crush the remaining 2 cups [70 g] potato chips. Scoop the dough into 1 1/2-tablespoon balls with a cookie scoop or measuring spoon, rolling each ball in the leftover crushed chips, and evenly place 12 on the prepared baking sheet.
- Sprinkle each cookie with flaky sea salt, and bake for 8 to 10 minutes, rotating at the halfway point, until lightly browned. Remove from the oven and press down on each cookie with a spatula to slightly flatten.
- Repeat with the remaining cookie dough.
- Let cool briefly and serve warm, because who doesn’t love a cookie warm from the oven? The cookies will keep in an airtight container on the counter for up to 3 days.