Make dough. In a large mixing bowl, cream together the butter, granulated sugar, and brown sugar until light and fluffy. Mix in the egg, egg yolk, and vanilla extract until fully incorporated.
Add dry ingredients. Stir in the flour, baking soda, and salt just until combined.
Fold in mix-ins. Gently fold in ½ cup of the crushed potato chips, the pretzels, and the chocolate chips.
Chill. Cover the dough and refrigerate for at least 30 minutes, or up to overnight.
Prep oven. Preheat the oven to 350°F and line a baking sheet with parchment paper. Place the remaining ½ cup crushed potato chips into a shallow bowl.
Shape cookies. Roll the dough into 2-inch balls, then roll each ball in the crushed potato chips to coat. Place cookies 2 inches apart on the prepared baking sheet.
Bake. Bake for 12 to 15 minutes, or until the edges are set and the tops are no longer glossy.
Cool. Let cookies rest on the baking sheet for 5 minutes before transferring to a wire rack to cool completely.
Notes
Chilling. Chilling improves texture and prevents excess spreading.
Chip texture. Crush potato chips and pretzels into roughly 1-inch pieces for best crunch.
Variations. Substitute up to ¾ cup butterscotch chips or caramel bits, reducing other mix-ins slightly.
Storage. Store cookies in an airtight container at room temperature for up to 7 days, best within 3 to 4 days.
Freezing. Freeze dough balls for up to 3 months and bake directly from frozen, adding 1 to 2 minutes to bake time.