Yes you can if you really can't find the vegetarian mushroom one, the flavor will be different, though. This specific brand of vegetarian mushroom oyster sauce is very popular in Taiwan as the flavor fits very well with many Taiwanese dishes. It imparts a nice umami flavor without the seafood-like flavor in typical oyster sauce. My mom prefers this to regular oyster sauce and uses it for stir fry or as a dipping sauce. So I highly recommend getting one if you haven't tried it before.