Low Carb Philly Cheesesteak Casserole – Big Flavor, Fewer Carbs

If you love a classic Philly cheesesteak but want to skip the bread, this casserole hits the spot. It’s loaded with tender beef, melty cheese, and all the iconic flavors—without the carb crash. Everything bakes in one dish, so it’s weeknight-friendly and great for meal prep.

It also reheats like a dream, making leftovers something to look forward to. Think comfort food, streamlined for a simpler, healthier routine.

Save

Low Carb Philly Cheesesteak Casserole - Big Flavor, Fewer Carbs

Print Recipe Pin Recipe

Prep Time 15 minutes mins

Cook Time 30 minutes mins

Total Time 45 minutes mins

Servings: 6 servings

Ingredients Method

Ingredients

  

• 1.25–1.5 pounds thinly sliced steak (ribeye is classic; sirloin or flank work too)
• 2 tablespoons olive oil (or avocado oil)
• 1 large yellow onion, thinly sliced
• 1 green bell pepper, thinly sliced
• 1 red bell pepper, thinly sliced (optional for color and sweetness)
• 8 ounces cremini or white mushrooms, sliced (optional but adds depth)
• 2 cloves garlic, minced
• 1 teaspoon kosher salt (plus more to taste)
• 1/2 teaspoon black pepper
• 1 teaspoon smoked paprika (optional, for a subtle smoky note)
• 1 teaspoon Worcestershire sauce (check label for low-carb options)
• 4 ounces cream cheese, softened
• 1/2 cup heavy cream
• 6–8 slices provolone (or 1.5 cups shredded provolone)
• 1 cup shredded mozzarella (stretchy melt factor)
• Fresh parsley (optional, for garnish)

Method

 

1. Preheat the oven: Set to 375°F (190°C). Lightly grease a 9x13-inch baking dish.
2. Sauté the veggies: Heat 1 tablespoon oil in a large skillet over medium-high. Add onions and peppers with a pinch of salt. Cook 5–7 minutes until softened and lightly browned. Add mushrooms and cook 3–4 minutes more. Stir in garlic for 30 seconds. Transfer to the baking dish.
3. Cook the steak: In the same skillet, add the remaining oil. Increase heat to high. Season steak with salt, pepper, and smoked paprika. Sear in batches for 1–2 minutes per side until just cooked. Do not overcook. Add Worcestershire and toss. Layer steak over the veggies.
4. Make the creamy binder: In a small bowl, whisk cream cheese and heavy cream until smooth. If stiff, microwave the cream cheese 10–15 seconds first. Season lightly with salt and pepper.
5. Assemble the casserole: Drizzle the cream mixture evenly over steak and veggies. Sprinkle mozzarella on top. Lay provolone slices to cover the surface.
6. Bake: Place in the oven for 12–15 minutes, until cheese is melted and bubbling at the edges.
7. Optional broil: For browned, blistered cheese, broil 1–2 minutes. Watch closely.
8. Rest and garnish: Let sit 5 minutes to set. Top with chopped parsley if you like. Serve hot.

Jump to Recipe Card

Save

What Makes This Special

Save

This casserole stays true to the soul of a Philly cheesesteak: savory steak, sautéed onions and peppers, and plenty of gooey cheese. But it swaps the roll for a low-carb, veggie-forward base that still feels hearty.

It’s fast to assemble, versatile with ingredients, and easy to scale for a crowd.

• Authentic flavor, simplified: All the classic elements, no sandwich required.
• Low carb and satisfying: Protein-rich and cheesy, so you won’t miss the bread.
• One-pan convenience: Less cleanup and great for busy nights.
• Customizable: Adjust the heat, cheese, and veggies to match your taste or what’s in the fridge.

What You’ll Need

• 1.25–1.5 pounds thinly sliced steak (ribeye is classic; sirloin or flank work too)
• 2 tablespoons olive oil (or avocado oil)
• 1 large yellow onion, thinly sliced
• 1 green bell pepper, thinly sliced
• 1 red bell pepper, thinly sliced (optional for color and sweetness)
• 8 ounces cremini or white mushrooms, sliced (optional but adds depth)
• 2 cloves garlic, minced
• 1 teaspoon kosher salt (plus more to taste)
• 1/2 teaspoon black pepper
• 1 teaspoon smoked paprika (optional, for a subtle smoky note)
• 1 teaspoon Worcestershire sauce (check label for low-carb options)
• 4 ounces cream cheese, softened
• 1/2 cup heavy cream
• 6–8 slices provolone (or 1.5 cups shredded provolone)
• 1 cup shredded mozzarella (stretchy melt factor)
• Fresh parsley (optional, for garnish)

Step-by-Step Instructions

Save

1. Preheat the oven: Set to 375°F (190°C). Lightly grease a 9×13-inch baking dish.
2. Sauté the veggies: Heat 1 tablespoon oil in a large skillet over medium-high. Add onions and peppers with a pinch of salt.

   Cook 5–7 minutes until softened and lightly browned. Add mushrooms and cook 3–4 minutes more. Stir in garlic for 30 seconds.

   Transfer to the baking dish.

3. Cook the steak: In the same skillet, add the remaining oil. Increase heat to high. Season steak with salt, pepper, and smoked paprika.

   Sear in batches for 1–2 minutes per side until just cooked. Do not overcook. Add Worcestershire and toss.

   Layer steak over the veggies.

4. Make the creamy binder: In a small bowl, whisk cream cheese and heavy cream until smooth. If stiff, microwave the cream cheese 10–15 seconds first. Season lightly with salt and pepper.
5. Assemble the casserole: Drizzle the cream mixture evenly over steak and veggies.

   Sprinkle mozzarella on top. Lay provolone slices to cover the surface.

6. Bake: Place in the oven for 12–15 minutes, until cheese is melted and bubbling at the edges.
7. Optional broil: For browned, blistered cheese, broil 1–2 minutes. Watch closely.
8. Rest and garnish: Let sit 5 minutes to set.

   Top with chopped parsley if you like. Serve hot.

Keeping It Fresh

Store leftovers in an airtight container in the fridge for up to 4 days. Reheat in a 325°F oven for 10–12 minutes or microwave in short bursts to avoid overcooking the steak.

For freezing, cool completely, wrap tightly, and freeze up to 2 months. Thaw overnight in the fridge, then reheat covered until warmed through.

To keep flavors bright, add a squeeze of lemon or a dash of hot sauce right before serving reheated portions. It wakes up the richness without adding carbs.

Save

Health Benefits

• Low in carbs: Skipping the roll reduces total carbs while keeping satisfaction high.
• Protein-packed: Steak delivers essential amino acids to support muscle and satiety.
• Veggie-forward: Peppers, onions, and mushrooms bring fiber, vitamin C, B vitamins, and antioxidants.
• Smart fats: Dairy fats can boost richness and help you feel full, which may support portion control.

If you’re tracking macros, portion into even squares and log ingredients by weight for accuracy.

You can lighten it up with half the cheese or swapping part of the heavy cream for unsweetened almond milk plus an extra ounce of cream cheese for thickness.

Common Mistakes to Avoid

• Overcooking the steak: The meat will cook again in the oven. Keep skillet time short to prevent dryness.
• Skipping the veggie sauté: Raw peppers and onions release water and can make the casserole soupy. Sauté first.
• Using thick cream cheese straight from the fridge: Soften it so the sauce spreads evenly.
• Overcrowding the pan: Cook steak in batches for a good sear instead of steaming.
• Not seasoning in layers: Add pinches of salt at each step for balanced flavor.

Recipe Variations

• Cheese Whiz nod: Stir 2–3 tablespoons of a low-carb cheese sauce into the cream mixture for a nostalgic twist.
• Mild heat: Add sliced banana peppers or a dash of hot sauce to the veggies.
• Shaved deli roast beef: In a pinch, use high-quality deli roast beef.

  Warm gently; don’t overcook.

• Ground beef version: Brown 1.25 pounds ground beef with onions and peppers, drain, then assemble as written.
• Extra veg: Add thinly sliced zucchini or riced cauliflower under the steak for more volume with minimal carbs.
• Dairy-light: Use half the cheese and swap heavy cream for unsweetened almond milk thickened with 1 teaspoon xanthan gum or extra cream cheese.
• Mushroom-forward: Double mushrooms and add thyme for a steakhouse vibe.

FAQ

What cut of beef works best?

Ribeye is the gold standard thanks to its marbling and tenderness. Sirloin is leaner but still flavorful. Flank steak can work if sliced extra thin against the grain and cooked quickly.

Can I make it ahead?

Yes.

Assemble up to the cheese layer, cover, and refrigerate up to 24 hours. Add 5–10 minutes to the baking time, and broil if needed to brown the top.

How do I keep it from getting watery?

Sauté veggies until most moisture cooks off, slice mushrooms thin, and avoid overloading with extra vegetables. Let the casserole rest after baking so juices settle.

Is there a good dairy-free option?

Use a dairy-free cream cheese and a meltable dairy-free cheese.

Replace heavy cream with unsweetened almond or coconut milk thickened slightly with a pinch of xanthan gum. Flavor with extra seasonings to compensate.

What can I serve with it?

Keep it low-carb with a crisp salad, roasted broccoli, or garlicky green beans. If you’re feeding mixed diets, offer toasted hoagie rolls on the side for bread lovers.

Can I use a slow cooker?

Not ideal.

The steak can overcook and the veggies release too much liquid. The oven method gives better texture and a bubbly, browned top.

How many servings does this make?

Generally 6 servings as a main dish. If you’re feeding big appetites or skipping sides, plan on 4–5 servings.

What seasonings pair well?

Garlic, black pepper, smoked paprika, and a splash of Worcestershire are classic.

You can also add onion powder, a pinch of cayenne, or dried thyme for extra depth.

Final Thoughts

This Low Carb Philly Cheesesteak Casserole delivers bold, familiar flavors in a simple, weeknight-friendly format. It’s rich, comforting, and easy to tailor to your preferences. With a short ingredient list and minimal prep, it’s a reliable go-to for anyone craving a cheesesteak experience without the bread.

Keep it classic, or riff with your favorite cheeses and veggies—either way, you’ll have a crowd-pleasing dinner with fewer carbs and zero fuss.