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If you crave comfort food but want to keep it low-carb and full of protein, this High Protein Low Carb Philly Cheesesteak Casserole will become your new go-to. It’s everything you love about a classic Philly cheesesteak — the tender beef, melty cheese, sautéed onions and peppers — reimagined as a hearty, scoopable casserole with zero bread and all the flavor.

Perfect for weeknight dinners or meal prepping, this dish satisfies those cheesesteak cravings without spiking your carbs. It bakes into a cheesy, creamy, savory masterpiece that’s incredibly filling yet keto and macro-friendly. If you love easy dinners that make leftovers worth fighting over, this one’s for you.

Why You’ll Love This High Protein Low Carb Philly Cheesesteak Casserole

This casserole is rich and indulgent but still keeps things clean and nourishing. It uses lean ground beef or shaved steak for high-quality protein, paired with veggies that bring crunch and sweetness. The creamy mixture gets its richness from cream cheese and a blend of gooey shredded cheese, creating a lasagna-like bake that pulls apart in cheesy strands.

It’s naturally gluten-free, totally grain-free, and can be customized for spice levels or cheese preference. Whether you’re on a low-carb lifestyle or just want a balanced dinner that feels like a treat, this casserole hits all the marks.

What Kind of Steak or Beef Should I Use?

You can go classic and use thinly shaved ribeye if you want that authentic cheesesteak flavor. But ground beef works just as well and is more accessible, budget-friendly, and faster to cook. Aim for 85/15 lean ground beef for a good balance of moisture and flavor. If you’re using shaved steak, make sure to cook it quickly over high heat to prevent it from drying out.

Ingredients for the High Protein Low Carb Philly Cheesesteak Casserole

This casserole is built on simple, whole ingredients that pack a punch in flavor and texture. The base is protein-rich, the veggies are sautéed for sweetness, and the cheese pulls it all together. Here’s what you’ll need:

• Ground beef or shaved steak – This is the protein powerhouse of the dish.
• Bell peppers – Adds color, crunch, and sweetness.
• Yellow onion – Brings that classic Philly flavor.
• Mushrooms – Optional but add a deep umami layer.
• Garlic – Always essential for flavor.
• Cream cheese – Makes the mixture creamy and rich.
• Shredded provolone or mozzarella – Melts beautifully on top.
• Salt and pepper – For simple seasoning.
• Worcestershire sauce – Adds savory, tangy depth.

How To Make the High Protein Low Carb Philly Cheesesteak Casserole

Step 1: Cook the Beef

Start by browning your ground beef (or shaved steak) in a large skillet over medium heat. Season with salt, pepper, and a splash of Worcestershire sauce. Once browned, drain any excess fat and set the meat aside.

Step 2: Sauté the Veggies

In the same pan, add a little oil and sauté the onions, bell peppers, and mushrooms until softened and slightly caramelized. Stir in the minced garlic during the last minute for extra aroma.

Step 3: Mix It All Together

Add the cooked beef back into the skillet with the vegetables. Stir in the cream cheese and let it melt into the mixture until everything is creamy and combined.

Step 4: Assemble the Casserole

Preheat your oven to 375°F. Transfer the beef and veggie mixture into a greased casserole dish. Sprinkle the shredded cheese evenly over the top.

Step 5: Bake

Bake for about 15-20 minutes or until the cheese is bubbling and golden around the edges. Let it rest a few minutes before serving.

How to Serve and Store This Casserole

This casserole is perfect served hot straight from the oven, scooped into bowls or onto plates. It’s hearty enough to stand on its own, but also works alongside a crisp green salad or some roasted low-carb veggies. One casserole dish serves about 4 to 6 people depending on portion size.

Leftovers store beautifully. Just cover and refrigerate for up to 4 days. Reheat in the microwave or in a 350°F oven until warmed through. It also freezes well – simply portion into airtight containers and thaw overnight before reheating.

What to Serve With High Protein Low Carb Philly Cheesesteak Casserole?

Steamed Broccoli

A simple side that adds fiber and freshness.

Cauliflower Mash

Mimics the comfort of mashed potatoes with none of the carbs.

Keto Garlic Bread

Crunchy and cheesy, the perfect pairing.

Cucumber Avocado Salad

Cool and creamy to balance the casserole’s richness.

Roasted Zucchini Spears

Oven-roasted with herbs and olive oil.

Pickled Onions

Sharp and tangy contrast to the creamy meat base.

Spaghetti Squash Noodles

Serve the casserole right on top of these for a faux-pasta vibe.

Want More Casserole Ideas?

If you love this low-carb twist on comfort food, here are more baked favorites to explore:

• Try this ultra-cozy Low Carb Chicken Casserole with creamy layers and melty cheese.
• Our Creamy Kielbasa Gnocchi Soup is a must-make for creamy, comforting spoonfuls.
• Don’t miss the Crockpot Loaded Steak and Potato Bake if you’re feeding a crowd.
• For a bolder flavor, check out Skirt Steak Rice Bowls with Chimichurri — high protein and flavor-packed.

Save This Recipe For Later

📌 Save this recipe to your Pinterest dinner board so you can come back to it any time.

Let me know how yours turned out! Did you use shaved steak or ground beef? Add mushrooms or leave them out?

Questions and tips are welcome in the comments — let’s help each other make every meal feel indulgent and easy.

Explore beautifully curated low-carb and high-protein dinners on Luna Meals on Pinterest and discover your new go-to comfort meal!

Conclusion

High Protein Low Carb Philly Cheesesteak Casserole checks all the boxes: comforting, low-effort, and macro-friendly. Whether you’re meal prepping, feeding a hungry household, or just want a cozy dinner with all the cheesesteak vibes, this casserole brings bold flavor with simple ingredients. It’s weeknight magic on a plate.

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