1 tablespoon plus 1 teaspoon extra-virgin olive oil
1 large clove garlic, finely grated
4 large portobello mushrooms, stemmed
2 tablespoons whole-wheat panko breadcrumbs
1 teaspoon finely chopped fresh oregano
Kosher salt and freshly ground black pepper
1 medium tomato, cut into 4 slices about 1/2 inch thick
4 ounces fresh salted mozzarella, cut into 4 slices