Philly Cheesesteak Casserole

A comforting, low-carb Philly Cheesesteak Casserole packed with tender shaved beef, caramelized bell peppers, and a rich, velvety provolone cheese sauce.

Why This Recipe Works:

• High-heat searing locks in the beef's natural juices while preventing the vegetables from steaming.
• Provolone cheese provides the perfect meltability and a sharp, salty bite that cuts through the rich beef.
• Baking the casserole allows the cream cheese and beef broth to emulsify into a velvety sauce that coats every bite.

Three years ago, I ruined a beautiful slab of ribeye in a flimsy, thin-bottomed pan that scorched the meat before the fat could even think about rendering. I stood there in my kitchen, tapping my tongs against my hip in absolute defeat, staring at grey, rubbery beef.

It was a sad night.

The problem with making cheesesteaks at home is the water content in grocery store bell peppers and onions. When you crowd them in a cold pan, they steam instead of sear, turning your meat into a soggy mess.

This casserole completely bypasses that soggy trap by utilizing a high-heat sear first, then letting the oven do the heavy lifting to melt the cheese into a beautiful, cohesive protein matrix. We are talking about tender shaved beef slicked in its own juices, topped with caramelized peppers, and smothered in a blanket of provolone. It is hands down the easiest way to feed a crowd without standing over a smoking griddle for an hour.

Let's get into the physics of it.

Philly Cheesesteak Casserole

• Publisher Storied Skillet
• Cuisine American
• Category Dinner, Low-Carb
• Prep Time 15 minutes
• Cook Time 20 minutes
• Servings 6
• Calories 420 calories
• Rating 4.8 3418
• Tags Philly Cheesesteak Casserole, low carb dinner, easy keto casserole, shaved beef recipe

Ingredients

• 1.5 lbs shaved beef (ribeye or sirloin)
• 2 tbsp olive oil, divided
• 1 large green bell pepper, thinly sliced
• 1 large yellow onion, thinly sliced
• 8 oz sliced mushrooms
• 1.5 tsp Diamond Crystal kosher salt
• 1 tsp freshly cracked black pepper
• 1 tsp garlic powder
• 8 slices provolone cheese
• 4 oz cream cheese, softened
• 1/2 cup beef broth

Directions

1. Preheat your oven to 375°F (190°C) and lightly grease a 9x13-inch baking dish.
2. Heat one tablespoon of olive oil in a large skillet over high heat until shimmering. Add the sliced bell peppers, onions, and mushrooms, cooking until caramelized and tender, about 6 to 8 minutes, then transfer them to a plate.
3. In the same skillet, add the remaining olive oil. Working in batches to avoid crowding, sear the shaved beef quickly for 2 to 3 minutes until browned, seasoning with Diamond Crystal kosher salt, black pepper, and garlic powder.
4. Reduce the heat to medium-low, return the vegetables to the skillet, and stir in the beef broth and cream cheese until a smooth, velvety sauce clings to the beef.
5. Transfer the beef and vegetable mixture into the prepared baking dish, spreading it into an even layer.
6. Layer the provolone cheese slices over the top, covering the beef completely.
7. Bake for 15 to 20 minutes, or until the cheese is melted, bubbly, and golden brown around the edges. Let cool for 5 minutes before serving.

Notes

• Always use Diamond Crystal kosher salt for seasoning. If you only have Morton's kosher salt or fine table salt, cut the volume in half (use 3/4 teaspoon instead of 1.5 teaspoons) to avoid an over-salted dish.
• Provolone is the superior choice here because of its high moisture-to-protein ratio, which allows it to melt smoothly without breaking into a greasy pool of oil.
• Do not crowd the skillet when searing the shaved beef. If you dump all the meat in at once, the temperature of the pan drops, the meat releases its juices, and you will end up boiling the beef instead of searing it.
• After a day in the fridge, the cream cheese sauce will firm up significantly. When reheating, add a splash of beef broth to loosen the sauce back to its original velvety texture.
• If you prefer a more traditional skillet meal without the baking step, check out our quick Philly Cheesesteak Skillet.

Serving Suggestions

This casserole is incredibly versatile and can be served as a low-carb main or piled high onto toasted bread. Here are a few of our favorite ways to enjoy it:

• Spoon it over a slice of toasted Steak Grilled Cheese Garlic Bread for the ultimate carb-loaded feast.
• Serve it alongside a crisp green salad tossed with a light vinaigrette to balance the rich, cheesy flavors.
• Stuff the leftovers inside warm hoagie rolls for a classic sandwich experience the next day.
• Pair it with roasted cauliflower or broccoli to keep the entire meal strictly low-carb.

Storage and Reheating

Store any leftover casserole in an airtight container in the refrigerator for up to four days. The flavors actually deepen overnight as the beef absorbs the savory notes of the caramelized onions and peppers.

It reheats beautifully.

To reheat, place a portion in a microwave-safe dish, cover it loosely to trap the steam, and heat on medium power for two minutes. Alternatively, warm it in a 350°F oven for 10 minutes until bubbly.

Bear with me here: do not freeze this casserole. The cream cheese in the sauce will undergo starch and fat separation upon thawing, leaving you with a grainy, watery mess that even a year of washing your favorite baking dish won't make you forget.

Ingredient Substitutes

If you need to swap things out based on what is in your pantry, here are some easy substitutions:

1. Shaved Beef: You can swap the ribeye for thinly sliced flank steak, sirloin, or even ground beef. If you want a fun twist, try our High Protein Creamy Philly Cheesesteak Mac and Cheese which uses ground beef.
2. Provolone Cheese: Sliced mozzarella or mild white cheddar will melt just as beautifully, though you will lose a bit of that classic tangy bite.
3. Mushrooms: If you are a purist who hates mushrooms, simply omit them and add an extra green bell pepper to keep the volume consistent.
4. Finger-Food Variation: If you want a fun party appetizer instead of a main dish, try making philly cheesesteak stuffed cheesy breadsticks.

I hope this comforting dish brings as much warmth to your table as it does to mine. Trust me on this one—once you master the high-heat sear, you will never look at a soggy cheesesteak the same way again.