Do i really need brown sugar to make peanut butter cookies?

While brown sugar isn't an essential ingredient in peanut butter cookies, it does provide a richer, more complex flavor. Brown sugar contains molasses, which imparts a slight caramel flavor to the cookies. Additionally, brown sugar helps to keep the cookies moist and chewy. If you don't have any brown sugar on hand, you can use an equal amount of granulated sugar. However, the cookies will be slightly different in flavor and texture.