This Philly Cheese Steak Soup began as a practical answer to a leftover roast beef night when I wanted all the satisfying flavors of a sandwich in spoonable form. I first made it on a rainy Sunday after a deli run produced more roast beef than we could eat. I wanted the smoky, beefy notes, the sweet-softness of sautéed onions and peppers, and the gooeyness of melted provolone, but in a bowl that warmed our hands as well as our bellies. The result was instantly family-approved, turning sandwich nostalgia into a cozy one-pot dinner.

The texture balances a silky, lightly thickened broth with tender ribbons of beef and soft vegetables. The half and half adds a gentle creaminess that carries the Worcestershire and garlic without overpowering the meat. When you spoon it and see the provolone stretch and melt on the surface, you get that same guilty pleasure as tearing into a hot sandwich. This version is forgiving—use leftover deli roast beef or chopped pan-seared ribeye—and it comes together quickly, making it perfect for a weeknight or a casual weekend supper.

Ingredients

• Butter (1/4 cup): Use unsalted butter so you can control seasoning; it provides the fat for sautéing and a silky mouthfeel to the base.
• Yellow onion (1 cup, diced): Look for a firm, sweet variety; onions caramelize slightly and provide aromatic sweetness that balances the beef.
• Green bell pepper (1 cup, diced): Choose a crisp pepper; it adds color, a subtle vegetal bite, and the classic sandwich profile.
• White mushrooms (6 ounces, sliced): Button or cremini work well; they add umami and soften to blend into the broth without dominating.
• Roast beef (8 ounces, chopped): Leftover deli roast beef or cooked sirloin both work; slice thinly and chop so every spoonful has tender meat.
• Garlic (1 tablespoon, minced): Fresh garlic is best; add late in the sauté to avoid bitterness and retain fragrance.
• All-purpose flour (1/4 cup): Creates a light roux with the butter to thicken the soup and give it body.
• Beef broth (4 cups): Use a low-sodium stock so you can season precisely; homemade or a quality boxed broth both work.
• Half and half (3 cups): Adds creaminess without being overly heavy; substitute whole milk for a lighter result or heavy cream for extra richness.
• Worcestershire sauce (1 tablespoon): Adds that savory, slightly tangy depth reminiscent of the sandwich.
• Salt and pepper (1 teaspoon each): Adjust to taste; start modestly because broth and cheese add salt.
• Cornstarch slurry (3 tablespoons cornstarch mixed with 1/4 cup water): Used to finish and ensure a glossy, clingy texture without making the soup gluey.
• Shredded provolone cheese: Use deli-style provolone for meltability; garnish each bowl so guests can control cheesiness.

Instructions

Melt the butter: Set a large, heavy-bottomed pot over medium heat and add 1/4 cup unsalted butter. Let it melt completely but do not let it brown. The butter is your flavor foundation and prevents the vegetables from sticking. Sauté the vegetables: Add 1 cup diced yellow onion, 1 cup diced green bell pepper, and 6 ounces sliced white mushrooms. Sauté until the onion is translucent and the peppers have softened, about 5 to 7 minutes. Watch for small brown bits on the bottom—those add flavor; deglaze with a splash of broth if necessary. Add the roast beef: Stir in 8 ounces chopped roast beef and toss to warm through, about 2 minutes. If your beef is cold from the fridge, allow a minute longer. The goal is to integrate the meat without overcooking it to toughness. Garlic and flour: Add 1 tablespoon minced garlic and cook until fragrant, about 30 seconds. Sprinkle 1/4 cup all-purpose flour evenly over the mixture and stir continuously for about 2 to 3 minutes to cook out the raw flour taste; this forms a light roux that will thicken the liquid. Add the broth and dairy: Gradually pour 4 cups beef broth into the pot while whisking or stirring to avoid lumps. Once incorporated, stir in 3 cups half and half and bring the mixture to a gentle boil. Reduce heat and simmer to let flavors marry, about 10 minutes. Season and thicken: Stir in 1 tablespoon Worcestershire sauce, 1 teaspoon salt, and 1 teaspoon pepper. Prepare a cornstarch slurry by whisking 3 tablespoons cornstarch with 1/4 cup cold water until smooth. Bring the soup to a simmer and slowly whisk in the slurry; simmer until the broth thickens to a velvety consistency, about 1 to 2 minutes. Finish with cheese: Reduce heat to low and stir in shredded provolone a handful at a time until melted and silky. Taste and adjust seasoning. Serve immediately topped with additional cheese and a sprinkle of fresh parsley if desired.

Storage Tips

Store cooled soup in airtight containers and refrigerate for up to three days. If freezing, leave out the shredded provolone and place the cooled soup in freezer-safe containers for up to three months. When reheating from frozen, thaw overnight in the refrigerator and warm gently over low heat, stirring occasionally to reincorporate any separated dairy. Re-add cheese just before serving to preserve meltiness. Use glass or BPA-free plastic containers with tight seals to prevent flavor transfer; label with date and contents for best practice.

Ingredient Substitutions

If you don’t have half and half, combine equal parts whole milk and heavy cream, or use whole milk alone for a lighter version. Swap provolone for mozzarella or Monterey Jack for a milder melt, or use smoked provolone for deeper flavor. If gluten-free is required, replace the flour with a 1:1 gluten-free flour mix and use a cornstarch slurry cautiously to finish. For a beefier broth, add a splash of low-sodium beef base. Vegetarian swaps—use diced seitan or roasted mushrooms in place of beef and vegetable broth instead of beef broth; the profile will change but remain comforting.

Serving Suggestions

Serve in deep bowls with extra shredded provolone on top and a sprinkle of chopped fresh parsley or chives. Offer crusty Italian or sourdough bread for dipping, or toasted baguette slices rubbed lightly with garlic. A simple green salad with a bright vinaigrette cuts through the richness, and pickled peppers or banana peppers on the side mirror the sandwich experience. For brunch, a small fried egg on top adds richness and visual appeal; for a heartier meal, pair with roasted potatoes or a grain salad.

Cultural Background

The classic Philly cheesesteak originates from Philadelphia, Pennsylvania, where thinly sliced ribeye with onions and melted cheese is served on a long roll. This soup is a contemporary adaptation that honors the core components—beef, onions, peppers, and melting cheese—while translating them into a creamy, spoonable format. It reflects a broader American tradition of turning beloved sandwiches into casseroles, chowders, or soups to create shareable, comforting mains that feed more people with less fuss.

Seasonal Adaptations

In summer, swap bell peppers for charred sweet peppers and add a handful of fresh tomatoes for brightness. In winter, use roasted root vegetables for added body and replace half and half with heavy cream for a richer, holiday-style bowl. During grilling season, use grilled steak and smoky peppers to introduce charred flavors, and in spring, incorporate fresh herbs like parsley, thyme, or a touch of lemon zest to lift the dish.

Meal Prep Tips

Make the base a day ahead: sauté vegetables, add broth and dairy, and cool completely before refrigerating. Reheat gently and fold in meat and cheese at the last minute to keep textures fresh. Portion into individual microwave-safe containers for weekday lunches, adding cheese just before serving. For larger batches, divide into single-serve portions before freezing; thaw overnight in the refrigerator and reheat slowly on the stovetop to preserve the creamy texture.

This soup captures the joyful, cheesy spirit of a Philly favorite while being adaptable, fast, and deeply satisfying—perfect for family nights, casual entertaining, or simply when you crave something warm and nostalgic. Give it a try and make it your own with the tweaks that suit your pantry and taste.