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Close up of mushroom philly cheeset.eak with provolone cheese
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4.93 from 14 votes

Vegetarian Mushroom Cheesesteak with Caramelized Onions

This vegetarian Philly cheesesteak is full of sauteed mushrooms and peppers and topped with sweet caramelized onions on a sub roll. 
Prep Time10 mins
Cook Time50 mins
Total Time1 hr
Course: Main Course
Cuisine: Vegetarian
Servings: 4 subs
Calories: 414kcal
Author: Cassidy Reeser, MS, RD

Ingredients

  • 2 tablespoons olive oil divided
  • 2 large onions white, yellow, and red all work; 3 small onions
  • ½ teaspoon salt
  • 16 ounces baby bella or white mushrooms thickly sliced
  • 1 red bell pepper, sliced sliced
  • 1 green bell pepper sliced
  • 1 tablespoon soy sauce
  • 1 tablespoon all-purpose flour
  • 1 teaspoon dry oregano
  • 4 6" sub rolls
  • 4 slices provolone cheese

Instructions

  • To make the caramelized onions: In a large skillet, heat 1 tablespoon olive oil over medium-high heat. Saute the sliced onions for 6-8 minutes, until lightly browned. Sprinkle with ½ teaspoon salt and lower the heat to medium-low. Stir the onions only every 9-10 minutes. They're ready when golden brown and sweet, which can take up to an hour.
  • In a medium skillet, heat 1 tablespoon of olive oil over medium-high heat. Add the mushrooms and peppers and saute until the mushrooms release most of their juices, about 7-8 minutes. 
  • Sprinkle mushrooms with soy sauce and oregano. To thicken the mushrooms and their juices, sprinkle with 1 tablespoon of flour, stirring to brown. 
  • Melt the provolone cheese by placing each slice over a section of mushrooms and peppers. Cover the pan with a lid to melt.
  • Scoop the melted cheese and mushrooms onto a toasted sub roll. Top with caramelized onions and enjoy!

Notes

  1. Leftovers and reheating: Store leftovers refrigerated in a closed container. Best within 3-4 days. Reheat in the microwave in just 1-2 minutes, or reheat on the stove-top over medium heat.
  2. Toasting the buns: Spread the buns with melted butter and garlic salt and toast at 350F for 3-4 minutes. This is the method that I use for meatball subs.

Nutrition

Serving: 1mushroom cheesesteak | Calories: 414kcal | Carbohydrates: 49g | Protein: 18g | Fat: 17g | Saturated Fat: 5g | Cholesterol: 19mg | Sodium: 1090mg | Potassium: 633mg | Fiber: 4g | Sugar: 11g | Vitamin A: 1290IU | Vitamin C: 69.9mg | Calcium: 250mg | Iron: 12.1mg