Ingredients
- 2 teaspoons extra-virgin olive oil
- 1 medium onion, sliced
- 4 large portobello mushrooms, stems and gills removed (see Tip), sliced
- 1 large red bell pepper, thinly sliced
- 2 tablespoons minced fresh oregano, or 2 teaspoons dried
- ½ teaspoon freshly ground pepper
- 1 tablespoon all-purpose flour
- 1/4 cup vegetable broth, or reduced-sodium chicken broth
- 1 tablespoon reduced-sodium soy sauce
- 3 ounces thinly sliced reduced-fat provolone cheese
- 4 whole-wheat buns, split and toasted
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