Biscuits are foods made from wheat flour with the addition of other food ingredients. It is made through the process of heating and printing. The characteristics of biscuits are generally determined by their crisp texture. One of its ingredients is Pedada fruit flour (PFF) which has high dietary fiber content. It serves as a complement when added to purple sweet potato (PSP) flour with a high source of anthocyanin and antioxidants. The purpose of this study is to optimize the effect of the proportion between PFF and PSP flour on product quality. The research method used was the Response Surface Methodology (RSM) code. The experimental level values were: