My only complaint is that removing the gills from the mushrooms is a messy job. But the veggies roasted up well. Definitely needed a bit more dressing - I will double it next time and set aside half to dress the lettuce. I cheated a bit and used bagged romaine which I did not "thinly slice". And I grilled the steak on our Traeger grill for 10 minutes on each side. Very tasty and DH loved it too. I served it with CL Bacon-Cheddar Corn Muffins and a nice pinot noir.
Baked veg 30min, turning every 10min. Made to recipe except we sliced the portobello (like the photo) rather than chopping like the directions. Also increased the dressing by half in case anyone wanted a bit more. Served with warm ciabbatta rolls. Excellent supper.