INGREDIENTS
1/8 tsp
Garlic powder
1/4 tsp
Oregano, dried
3
Portobello mushroom caps (about 1 lb.)
1/4 tsp
Thyme, dried
1
Yellow onion
2 cups
Vegetable broth
1 tbsp
Soy sauce
1/2 tbsp
Brown sugar
1 pinch
Salt and pepper
4
6-inch french or ciabatta rolls
2 tbsp
Butter
4
slices Provolone