I don't know how you've already tried but I would fry the mushrooms in frylight with some easy garlic and then add a little vegetable stock and simmer to reduce the liquid.
I spray pan with fry light.Then I simmer mine in chicken bovril and beef stock mixed(sounds yucky but works for this) .I put Lazy garlic in the stock. Simmer till gone.Allow to dry fry(this is why I used the frylight-seems to coat pan despite water) to get rid of any extra moisture and give mushrooms that fried texture.I find thet feel soggy if I dont do the last bit.
I quite simply chop some garlic as finely as i can, fry this in frylight to soften (medium heat) - dont let it burn or brown.
Then add the mushrooms and a tsp of water if they dry out.
Recently tbh i've cheated! lol morrisons do a garlic and pepper grinder and i just sprinkle this on my mushrooms whilst cooking - they're really yum! xx