The key ingredients in this cookie recipe include butter, brown sugar, flour, baking powder, and chocolate, among others. Butter, used at room temperature, creates a rich and creamy base that results in a tender texture. Brown sugar not only adds sweetness but also contributes a subtle caramel flavor, enhancing the overall taste profile. The inclusion of flour provides structure, while the baking powder ensures the cookies rise appropriately, giving them a light and airy mouthfeel. Walnuts lend a delightful crunch and nutty richness, complementing the sweetness of the chocolate. The chopped dark chocolate and chocolate drops provide bursts of chocolate flavor throughout the cookie, making each bite a decadent experience. Together, these ingredients create a well-balanced cookie that is crunchy on the outside and soft on the inside.