Ingredients
- 2 tablespoons extra-virgin olive oil
- 2 tablespoons chopped shallot
- 1 (8-ounce) package cremini mushrooms, thinly sliced
- 1 teaspoon chopped fresh thyme
- 2 tablespoons balsamic vinegar
- 8 thin slices rye bread (about 1 ounce each)
- 2 tablespoons unsalted butter, softened
- 4 (1-ounce) slices Swiss cheese
- ½ cup shredded Gruyère cheese
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