Mushroom "Philly Cheesesteak” Sandwiches | Girls Just Wanna Eat | Umami

Ingredients

• 2 Tbsp olive oil
• 1 medium onion, sliced
• 4 large portobello mushrooms, sliced OR 8 oz cremini mushrooms, sliced
• 1 large red bell pepper, thinly sliced
• 2 tsp dried oregano
• ½ tsp freshly ground pepper
• 1 Tbsp all-purpose flour
• ¼ cup vegetable broth, or low-sodium chicken broth
• 2 Tbsp low-sodium soy sauce
• 4 slices provolone cheese
• 4 buns (any kind)
• Large handful of spinach