Prepare. Preheat the oven to 350°F and line a baking sheet with parchment paper. To make more cookies at once, you can line a second sheet with parchment to bake 2 batches simultaneously.
Make the brown butter: melt butter in a pot over medium heat, stirring constantly. Reduce the heat to medium-low when the butter starts to bubble, then cook for another 5 to 10 minutes until the butter is amber or golden brown in color and smells nutty. Chill the butter slightly in the fridge or place the pot in a bowl of ice and stir the butter with a whisk or spoon to cool it slightly. It should still be soft.
16 tbsp unsalted butter
Mix dry ingredients together. Mix the flour, baking soda, salt together in a bowl and set aside.
2 ¼ cups all-purpose flour, ¾ tsp baking soda, 1 tsp salt
Mix the wet ingredients together. In a separate large mixing bowl, add the brown butter and both sugars and mix together with a whisk, spoon, or electric beater. Mix in the eggs and the vanilla.
16 tbsp unsalted butter, ¾ cup granulated sugar, ¾ cup brown sugar, 2 eggs, 2 tsp vanilla
Finish the cookie dough. Add the dry ingredients to the bowl with the wet ingredients and mix them in until just combined. Then fold in the chocolate chips, toffee chips, and potato chips.
½ cup toffee bits, 1 cup milk chocolate chips, 1 cup broken potato chips
Scoop the dough. For large cookies, scoop about 2 to 3 tbsp of dough per cookie. This recipe should make about 16 to 20 large cookies.
Distribute the dough. Spread 4 to 6 cookie dough balls onto the prepared baking sheet (if you’re using 2 sheets, spread out another 4-6 cookies on the second sheet). Press a couple more chocolate chips and crushed potato chips onto the tops of each dough ball so that they’ll bake into the tops.
Bake the cookies. Bake for about 10 minutes or until the edges look golden brown and cookies look slightly less done in the middle. They’ll continue to cook for a few minutes after they come out of the oven, and cooking them a little less keeps them fudgy later. Lightly sprinkle a little flaky sea salt on top of the baked cookies. [You can skip this if you are watching your salt intake.]
Flaky sea salt
Shape the cookies. While the cookies are still warm, place an inverted glass or biscuit cutter over each one so that the cookie fits inside the glass or cutter without being smashed on the edges. Move the glass or cutter in a circular motion to shape each cookie into a perfect circle. This will also help the cookies get some wrinkles and extra chewiness.
Let them rest before eating. Let the cookies rest for a few minutes, then move them to a rack to cool completely before eating. The cookies are fudgier and more toffee-like after they've rested.