Vegetarian Mushroom Philly Cheese Steak Sandwiches

By Amanda Sheumaker

4.5 / 5

10min

17min

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1 tablespoon butter divided
1 tablespoon olive oil divided
1 (8 ounce) package baby bella (cremini) mushrooms sliced
½ teaspoon fresh thyme leaves
salt and freshly ground black pepper to taste
1 tablespoon soy sauce
1 bell pepper sliced into strips
1 onion sliced
2 slices provolone cheese cut in half
2 hoagie rolls split lengthwise
2 teaspoons Dijon mustard or more to taste