Use unsalted butter. Since I like to top these with some extra sea salt, I want to make sure to control the amount of salt that’s in the cookies. Use kosher salt for the perfect level of salt to balance the sweetness in the dough.
Don’t use burnt butter. If the butter overcooks, you have to start over, sorry!
I like using 00 Italian flour to make these light yet chewy but regular all-purpose flour works as well.
Refrigerate the dough while the oven heats up. It helps the dough set up. I usually don’t like this step with other recipes, but since we are using melted butter it is necessary for the structure of the cookies.
Make these ahead and keep in the fridge or freezer!
Chocolate chips can be used instead of chopped chocolate. You might need an extra 1/2 cup since it doesn’t pack down as much as the chopped chocolate does.