I marinated the portabellas in olive oil + balsamic + soy sauce.
Put them on a sheet pan in the oven for 350 for 10 minutes.
In a separate pan I sautéed onions + bacon + zucchini + panko breadcrumbs + thyme + goat cheese + a nob of butter + s+ p. Got it browned and set it aside to stuff the mushrooms.
Stuffed the mushrooms and baked for another 10 minutes.
I served them over a simple mixed green and arugula salad with olive oil + red wine vin + s + p.