This High Protein Low Carb Philly Cheesesteak Casserole delivers all the bold, savory flavors of a classic cheesesteak — without the bread. Tender beef, sautéed peppers and onions, and layers of melty cheese come together in a hearty, keto-friendly bake that’s satisfying and simple.
Inspired by the legendary sandwich from Philadelphia, this casserole transforms the iconic flavors of the Philly cheesesteak into a protein-packed, low-carb dinner perfect for weeknights or meal prep.
If you’re craving comfort food while staying low carb, this recipe hits the spot.
Why You’ll Love This Philly Cheesesteak Casserole
- High in protein
- Low in carbohydrates
- Keto-friendly
- One-pan prep
- Great for meal prep
- Bold, cheesy flavor
It’s indulgent taste with healthier balance.
Ingredients You’ll Need
Main Ingredients
- 1 ½ lbs thinly sliced steak (sirloin or ribeye)
- 1 tablespoon olive oil
- 1 green bell pepper, sliced
- 1 red bell pepper, sliced
- 1 medium onion, sliced
- 3 cloves garlic, minced
- 1 teaspoon Italian seasoning
- Salt and black pepper to taste
- 6–8 slices provolone cheese
- 1 cup shredded mozzarella (optional for extra melt)
Optional Add-Ins
- Mushrooms
- Red pepper flakes
- Cream cheese (for creamier texture)
How to Make High Protein Low Carb Philly Cheesesteak Casserole
Step 1: Preheat the Oven
Preheat oven to 375°F (190°C).
Lightly grease a casserole dish.
Step 2: Cook the Vegetables
Heat olive oil in a large skillet over medium heat.
Sauté onions and bell peppers for 4–5 minutes until softened.
Add garlic and cook for 30 seconds.
Remove from skillet and set aside.
Step 3: Cook the Steak
In the same skillet, add sliced steak.
Season with Italian seasoning, salt, and pepper.
Cook 3–5 minutes until browned and just cooked through.
Step 4: Assemble the Casserole
Spread cooked steak evenly in the casserole dish.
Layer sautéed vegetables over the top.
Cover with provolone slices and sprinkle mozzarella if using.
Step 5: Bake
Bake for 10–15 minutes until cheese is melted and bubbly.
Broil for 1–2 minutes for a golden top if desired.
Serve hot.
Pro Tips for Best Results
- Slice steak thinly for tenderness.
- Don’t overcook beef before baking.
- Drain excess moisture from vegetables.
- Use freshly shredded cheese for best melt.
Customization Ideas
Extra Creamy Version
Mix in 2 tablespoons of cream cheese before baking.
Spicy Upgrade
Add sliced jalapeños or crushed red pepper.
Turkey Option
Use lean ground turkey instead of steak.
Loaded Version
Top with sautéed mushrooms.
Serving Suggestions
- Serve as a standalone low-carb meal
- Pair with a simple side salad
- Add roasted cauliflower
- Serve over cauliflower rice
- Use leftovers to stuff into low-carb wraps
Storage Tips
- Store in an airtight container for up to 4 days.
- Reheat in oven or skillet for best texture.
- Freeze for up to 2 months.
It’s excellent for weekly meal prep.
Nutritional Highlights
- High in protein
- Low in carbohydrates
- Keto-friendly
- Rich in iron
- Balanced with vegetables
It’s comfort food that supports a low-carb lifestyle.
Frequently Asked Questions
What cut of steak works best?
Sirloin or ribeye are ideal for tenderness and flavor.
Can I make this dairy-free?
Use dairy-free cheese alternatives.
Is this keto-friendly?
Yes, it’s naturally low carb.
Can I prepare it ahead of time?
Yes, assemble and refrigerate before baking.
Can I use ground beef?
Yes, ground beef works as a budget-friendly option.
Final Thoughts
High Protein Low Carb Philly Cheesesteak Casserole delivers bold, cheesy flavor in a satisfying, bread-free format. With tender steak, sautéed peppers, and melty cheese, it captures everything you love about the classic sandwich — while keeping carbs low.
It’s hearty, comforting, and perfect for weeknight dinners or meal prep success. 🥩🧀✨