Mushroom 'Cheesesteak' Lettuce Wraps

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2 tablespoons soy sauce

2 tablespoons balsamic vinegar 

1 teaspoon garlic powder 

1 teaspoon dried oregano 

Freshly ground black pepper 

4 large portobello mushrooms, stems removed, gills scraped out, thinly sliced 

1 teaspoon olive oil 

1 red bell pepper, sliced 

1 small yellow onion, sliced 

4 slices provolone cheese 

1 head butter lettuce, leaves separated