Citrus fruits (CF) are a rich source of dietary fiber, vitamins, and minerals. CF-derived various secondary metabolites include coumarins, alkaloids, limonoids, flavonoids, phenolic acids, carotenoids, and essential oils that play a vital role in the human body. However, along with CF, its by-product (peel) is also nutritious. In the current lifestyle scenario due to the increasing demand for sustainable healthy diets, CF peel is utilized and transformed as waste into a valuable, affordable, and nutritious compound to be utilized as a good source of food fibers, and low-calorie bulk ingredients in food application. This study focus on the preparation of CF (kinnow, and mosambi) peels powder by using different processing methods (blanching, boiling, and steaming), and drying (sun, and oven drying) methods as well as analysis of nutrients, physico-chemical composition, and antioxidant properties. The proximate analysis shows the presence of moisture, protein, crude fiber, fat, and carbohydrate in different concentrations. Antioxidant properties were shown that vitamin C content was higher in mosambi peel powder, and ferric reducing ions were also observed higher in steamed sundry mosambi peel powder. Then after, an attempt was made to develop fiber-rich biscuit, cake, and ice cream by supplementing both kinnow and mosambi peel powder in different concentrations of ( 2%, 4%, and 6%) respectively. Thus, results recommended that supplementing these fiber and antioxidant-rich peel powders in food products has the best utilization for treating various human diseases such as cancer, and cardiovascular diseases, and natural tool for obesity that kills human fats.