Ingredients
- 2 tablespoons extra-virgin olive oil
- 2 tablespoons unsalted butter , melted, divided
- 1 tablespoon plus ½ teaspoon chopped fresh thyme , divided, plus leaves for garnish
- ½ teaspoon salt
- ½ teaspoon ground pepper
- 3 large sweet onions ( 12 oz. each), peeled and sliced 1-inch thick
- ⅓ cup panko breadcrumbs
- ½ cup lower-sodium beef broth
- 1 tablespoon sherry vinegar
- ½ cup shredded Gruyère cheese
- ½ cup shredded low-moisture part-skim mozzarella cheese
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