Philly Cheesesteak Sandwiches

If you love the rich, comforting bite of a classic cheesesteak but want a lighter, meat-free option, this Portobello “Philly Cheesesteak” sandwich is about to become your new favorite. Packed with juicy mushrooms, sweet caramelized onions, and gooey melted cheese, it delivers all the savory satisfaction of the original—no steak required.

Portobello mushrooms are the star here, bringing a naturally “meaty” texture that soaks up flavor beautifully. Combined with colorful bell peppers and herbs, this sandwich feels indulgent yet balanced. Served on whole-wheat buns, it’s a wholesome upgrade that doesn’t skimp on taste.

Course Main Course

Cuisine American

Prep Time 10 minutes

Cook Time 15 minutes

Total Time 25 minutes

Ingredients

2 teaspoons extra-virgin olive oil
1 medium onion thinly sliced
4 large portobello mushrooms stems and gills removed, sliced
1 large red bell pepper thinly sliced
2 tablespoons fresh oregano or 2 teaspoons dried
½ teaspoon ground black pepper
1 tablespoon all-purpose flour
¼ cup vegetable broth or reduced-sodium chicken broth
1 tablespoon reduced-sodium soy sauce
3 ounces reduced-fat provolone cheese thinly sliced
4 whole-wheat buns split and toasted

Instructions

Heat the olive oil in a large nonstick skillet over medium-high heat. Add the sliced onion and cook, stirring frequently, until it softens and begins to turn golden—about 2 to 3 minutes.
Add the sliced portobello mushrooms, bell pepper, oregano, and black pepper. Continue cooking, stirring often, until the vegetables are tender and slightly wilted, about 7 minutes. The mushrooms will release moisture and develop a rich, savory aroma.
Reduce the heat to low. Sprinkle the flour over the vegetables and stir well to coat. Pour in the broth and soy sauce, stirring until everything is combined. Let it simmer gently until slightly thickened.
Remove the skillet from heat. Lay the provolone slices evenly over the vegetable mixture. Cover the pan and let it sit for 1 to 2 minutes, just until the cheese melts into a luscious layer.
Divide the mixture into four portions, keeping the melted cheese on top. Scoop each portion onto a toasted whole-wheat bun. Serve immediately while warm and melty.

Recipe Notes

Tip

The dark gills under portobello mushrooms are completely edible, but if you prefer a cleaner look or milder flavor, simply scrape them out with a spoon before slicing.

Why You’ll Love It

This sandwich hits all the right notes—savory, cheesy, hearty, and satisfying—while staying vegetarian-friendly. It’s quick enough for a weeknight meal and impressive enough to serve guests. Plus, with fiber-rich whole-wheat buns and nutrient-packed veggies, it’s comfort food you can feel good about.