When stored at room temperature these brownies stay fresh and perfectly edible for 2 whole days. After this time, they should be transferred to the fridge where they will continue to stay fresh for a further 2-3 days. Chocolate matcha brownies stored in the fridge from the outset will, however, stay fresh for longer (up to 7 days). Once baked (and cooled) these fudgy matcha brownies can also be frozen for up to 3 months. Try slicing and wrapping individually so squares can be pulled out as and when required.