Ingredients
- 2 tbsp. extra-virgin olive oil, divided
- 8 oz. baby bella or white button mushrooms, thinly sliced
- 0.25 small yellow onion, very thinly sliced
- 2 cloves garlic, minced
- 12 oz. sirloin steak, very thinly sliced
- 2 tbsp. balsamic vinegar
- 8 thick slices white sandwich bread
- 4 tbsp. unsalted butter, room temperature
- 8 slices provolone cheese
- 2 tbsp. French’s Creamy Yellow Mustard, plus more for serving
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