Preheat oven to 350ºF. Using a stand mixer or hand mixer, combine butter, brown sugar, and egg. Once thoroughly mixed, add the bread flour, baking powder, baking soda, and salt.
Once this mixture is fully combined, add chocolate chips and walnuts!
Form dough into cookie shapes and place on a parchment paper lined baking sheet.
Bake in the preheated oven for 12 to 15 minutes.
When done baking, remove from heat and top with the anchovies or sardines. Let cool and enjoy!