Oyster mushrooms generate large amounts of agricultural waste including stems, leftover plant material, and spent growing substrate. These waste products contain many healthy compounds like fiber, β-glucans, and antioxidants that are usually thrown away. Scientists are developing new extraction technologies using ultrasound, microwaves, and other methods to recover these beneficial compounds from mushroom waste for use in functional foods like meat products, baked goods, and dairy items, reducing waste while creating healthier food ingredients.