Keto Low-Carb Philly Cheese Steak Casserole
This Keto Low-Carb Philly Cheese Steak Casserole delivers all the bold, savory flavors of a classic Philly cheesesteak without the bread. Tender strips of seasoned beef are combined with sautéed peppers, onions, mushrooms, and a rich, creamy cheese sauce, then baked under a bubbly layer of provolone and mozzarella. It’s a hearty, satisfying meal that’s perfect for weeknight dinners or meal prep.
Prep Time: 15 minutes
Cook Time: 35 minutes
Total Time: 50 minutes
Servings: 6
Why You’ll Love This Recipe
Keto and low-carb friendly
High in protein and healthy fats
Rich, cheesy, and comforting
Easy one-dish dinner
Perfect for meal prep
Family-friendly
Naturally gluten-free
Ingredients
For the Beef Mixture
2 pounds thinly sliced sirloin, ribeye, or shaved beef
2 tablespoons butter
1 tablespoon olive oil
1 medium onion, thinly sliced
1 green bell pepper, sliced
1 red bell pepper, sliced
8 ounces mushrooms, sliced
3 cloves garlic, minced
1 teaspoon Worcestershire sauce (check for added sugar if following strict keto)
1 teaspoon sea salt
½ teaspoon black pepper
½ teaspoon smoked paprika
For the Cheese Sauce
4 ounces cream cheese, softened
½ cup heavy cream
1 cup shredded mozzarella cheese
½ cup shredded sharp cheddar cheese
Topping
8 slices provolone cheese
½ cup shredded mozzarella cheese
2 tablespoons grated Parmesan cheese
Chopped fresh parsley (optional)
Kitchen Equipment
Large skillet
9×13-inch baking dish
Mixing spoon
Measuring cups and spoons
Instructions
Step 1: Prepare the Oven
Preheat the oven to 375°F (190°C).
Lightly grease a 9×13-inch baking dish.
Step 2: Cook the Vegetables
Heat the butter and olive oil in a large skillet over medium heat.
Add the onions, bell peppers, and mushrooms.
Cook for 6–8 minutes, stirring occasionally, until the vegetables are tender.
Add the garlic and cook for 30 seconds until fragrant.
Transfer the vegetables to a plate.
Step 3: Cook the Beef
Increase the heat to medium-high.
Add the sliced beef to the skillet.
Season with salt, pepper, smoked paprika, and Worcestershire sauce.
Cook for 4–6 minutes, stirring occasionally, until the beef is browned.
Return the cooked vegetables to the skillet and mix well.
Step 4: Make the Cheese Sauce
Reduce the heat to low.
Stir in the cream cheese until melted.
Add the heavy cream and mix until smooth.
Fold in the mozzarella and cheddar cheese until a creamy sauce forms.
Step 5: Assemble the Casserole
Transfer the beef mixture to the prepared baking dish.
Arrange the provolone slices evenly over the top.
Sprinkle with the remaining mozzarella and Parmesan cheese.
Step 6: Bake
Bake for 20–25 minutes, or until the cheese is melted, bubbly, and lightly golden.
For a browned top, broil for 2–3 minutes, watching carefully.
Step 7: Serve
Let the casserole rest for 5 minutes before serving.
Garnish with chopped parsley if desired.
Expert Tips
Choose Thinly Sliced Beef
Shaved ribeye or sirloin cooks quickly and provides the most authentic Philly cheesesteak texture.
Don’t Overcook the Beef
Cook just until browned to keep it tender and juicy.
Soften the Cream Cheese
Room-temperature cream cheese melts more easily into a smooth sauce.
Freshly Shred the Cheese
Freshly shredded mozzarella and cheddar melt better than pre-shredded varieties.
Delicious Variations
Bacon Philly Casserole
Add 6–8 slices of cooked, crumbled bacon before baking.
Spicy Version
Mix in sliced jalapeños or a pinch of crushed red pepper flakes.
Extra Cheesy
Add Monterey Jack or white cheddar for an even richer cheese blend.
Chicken Philly Casserole
Substitute thinly sliced chicken breast or thighs for the beef.
What to Serve with Keto Philly Cheese Steak Casserole
Pair this casserole with:
Roasted broccoli
Garlic butter green beans
Cauliflower mash
Zucchini noodles
Side salad with olive oil vinaigrette
Sautéed spinach
Storage Instructions
Refrigerator
Store leftovers in an airtight container for up to 4 days.
Freezer
Freeze in a freezer-safe container for up to 3 months.
Thaw overnight in the refrigerator before reheating.
Reheating
Oven: Bake at 350°F (175°C) for 15–20 minutes until hot.
Microwave: Heat individual portions in 30-second intervals, stirring between intervals.
Nutritional Information
Approximate per serving:
Calories: 520
Protein: 39g
Fat: 37g
Net Carbohydrates: 6g
Fiber: 2g
Nutrition values are estimates and will vary depending on the ingredients used.
Frequently Asked Questions
Can I use ground beef instead of sliced steak?
Yes. Ground beef makes an affordable alternative, though the texture will be different from a traditional Philly cheesesteak.
Is this casserole keto-friendly?
Yes. With approximately 6 grams of net carbs per serving, it’s suitable for most ketogenic meal plans.
Can I prepare it ahead of time?
Absolutely. Assemble the casserole, cover it, and refrigerate for up to 24 hours before baking.
What cheese is best for a Philly cheesesteak casserole?
Provolone is the classic choice, but mozzarella, white American cheese, Monterey Jack, or sharp cheddar also work well.
Can I make it without mushrooms?
Yes. Simply omit the mushrooms or replace them with extra bell peppers if you prefer.
Final Thoughts
This Keto Low-Carb Philly Cheese Steak Casserole transforms the classic sandwich into a hearty, cheesy, low-carb comfort meal. With tender beef, sautéed peppers and onions, a creamy cheese sauce, and a golden layer of melted provolone, it’s a satisfying dinner that’s perfect for busy weeknights, family meals, or meal prep. Every bite is packed with rich Philly cheesesteak flavor—without the carbs! 🥩🧀🫑🍽️
