2 tablespoons extra-virgin olive oil
1 pound white button mushrooms, ends trimmed (but stems still attached) and washed, quartered and/or halved to the same size
Kosher salt and freshly ground black pepper
Kosher salt and freshly ground black pepper
4 sprigs fresh thyme
4 small cloves garlic, peeled and smashed
1/4 to 1/2 cup dry Marsala
1/2 pound spinach leaves, washed and dried