Sid, could the below recipe be close?
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Title: Recipe(tried): Portabello mushrooms...
Posted By: SuzannePa:-)
Date: October 7th 1999
In Reply to: ISO: Recipes using Portabello mushrooms...
Board: Vegetarian Recipe Swap

Fleigh, I've made this before it really doesn't have a
name...so I'll call it

Portobella Stacks!

Marinate mushrooms in olive oil, fresh crushed garlic
and salt and pepper, for 1/2 an hour.

Pan sear them in a cast iron skillet or any skillet, set
aside.

Then stack them with a slice of tomatoe, a leaf of
basil, and a slice of fresh mozzarella. Place them in
a baking dish, pierce with a toothpick.
Bake till warmed through and cheese is slightly
melted.
Arrange them on the plate and drizzle with a good
extra-virgin olive oil.

They are awfully delicious!
Enjoy,
Suzanne
I've also used them as above as a veggie burger!