If your granola is soft, you can do a quick roast on them. If this is the case after baking, they likely needed more time to toast thoroughly. If they are soggy after storage, they may have been stored while still warm. To fix this, spread the granola on a baking sheet and heat it in a 400-degree oven for about 5 minutes. This quick high temp bake is only for reheating and should only be done for a few minutes to prevent burning.