This study examined growing oyster mushrooms on different substrate mixtures combining wheat straw with recycled coffee grounds and olive plant waste. The researchers found that mushrooms grown on substrates with lower amounts of these waste materials produced comparable yields to standard straw while offering better nutritional profiles, including higher protein and lower fat content. The findings suggest that using these recycled agricultural wastes could benefit mushroom farming in regions where wheat straw is difficult to obtain, though lead contamination from coffee grounds was a concern requiring better cleaning procedures.