When Chestnut mushrooms aren’t available, several alternatives can replicate their unique flavor and texture. Cremini mushrooms are the closest match, offering a similar earthy taste. Shiitake mushrooms provide a deeper, more umami-rich flavor, while button mushrooms are a milder, more accessible substitute. For heartier options, portobello mushrooms add a meaty texture and bold taste, ideal for grilling or stuffing. These substitutes ensure your dishes maintain depth and flavor, making them great replacements in soups, stews, and sautés.