Preheat the oven to 350 F/180 C. Line two large baking sheets with parchment paper and set them aside.
Melt the butter and pour into a mixing bowl. It should be warm, not steaming hot. Vigorously whisk in the sugar and light brown sugar for 1 minute.
Whisk in the egg, egg yolk, and vanilla until combined.
Add the flour, baking soda, and salt and fold them into the dough until almost combined. Then fold in the coconut, potato chips, chocolate, and walnuts until just combined. Set the dough aside to firm up for 10 minutes.
Use a large (3 tablespoon) cookie scoop to scoop the dough onto a parchment lined baking tray spaced at least 2 inches apart.
Bake for 8-10 minutes, or until the edges are a light golden brown and the middle is pale and puffy.
Right out of the oven, press in more crushed chips, chopped chocolate, walnuts, and coconut if desired.
Let cool on a wire rack before removing then enjoy!