Keto Philly cheesesteak casserole is for anyone who’s ever stared at a cheesesteak and thought the roll was the least interesting part. Thin-sliced steak, peppers, onions, and mushrooms bake in a light, cheesy custard under a lid of melted provolone. You eat it with a fork and don’t miss the bread.
Each serving has 5 g net carbs and 47 g of protein for about 655 calories. A single hoagie roll on its own usually carries more carbs than that.
Rich dishes like this are satisfying, but calories add up quickly. If you’d like a clear picture of your daily fat and protein targets, my free macro calculator maps them out for you.
- 5 g net carbs and 47 g protein per serving, about 655 calories.
- Freeze the steak for 30 minutes before slicing. It firms up and cuts paper-thin.
- Sear in batches. A crowded pan steams the meat gray instead of browning it.
- Eggs and cream cheese bind it so it slices into neat squares.
- Provolone is classic, but white American or cheddar work if that’s your cheesesteak.
Why This Works on Keto
Takeout cravings don’t disappear on keto; they just get redirected. Having a low-carb version of a food you already love makes it much easier to say no to the original when you’re tired and hungry.
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Steak is dense with protein and fat and has zero carbs. The eggs add even more protein and turn the filling into something you can slice and portion, which matters when you’re cooking once for several meals.
Peppers, onions, and mushrooms bring volume and the flavor that makes a cheesesteak taste like a cheesesteak. They’re used in measured amounts so the dish stays comfortably within a keto dinner range.
A Few Notes on the Ingredients
Ribeye steak is the traditional cheesesteak cut because its marbling keeps thin slices tender. Sirloin is leaner and cheaper; if you use it, don’t skip the butter in the pan.
Provolone should be mild and sliced thin so it melts into an even layer. Deli-sliced works better than pre-shredded, which is often coated to stop it clumping.
Eggs and cream cheese form the custard that holds everything together. Softened cream cheese whisks in smoothly; cold cream cheese leaves lumps.
Green bell pepper is lower in carbs than red and gives the classic sharp cheesesteak flavor. Slice it into thin strips so it cooks at the same pace as the onions.
Keto Philly Cheesesteak Casserole
Ingredients
Equipment
Method
- Freeze the steak for 30 minutes, then slice it as thinly as possible against the grain. Heat the oven to 350°F and grease a 9×13-inch baking dish.
- Slice the bell pepper and onion into thin strips, slice the mushrooms, and mince the garlic.
- Heat the avocado oil in a large skillet over high heat. Sear the steak in two or three batches, 1 to 2 minutes per batch, seasoning with half the salt and pepper. Transfer to the baking dish.
- Lower the heat to medium, add the butter, and cook the pepper, onion, and mushrooms until soft and lightly browned, 6 to 8 minutes. Stir in the garlic for 1 minute, then spread the vegetables over the steak.
- Whisk the eggs, softened cream cheese, heavy cream, and the remaining salt and pepper until smooth. Pour evenly over the steak and vegetables.
- Lay the provolone slices over the top to cover. Bake 25 to 30 minutes, until the center is set and the cheese is bubbling and golden. Rest 10 minutes, then cut into 6 squares.
Nutrition
Notes
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- Swap the protein: Thin-sliced chicken breast makes a chicken cheesesteak version. Cook until no pink remains before assembling.
- Skip the eggs: For a loose skillet version, pile the seared filling in a pan, top with provolone, and broil until bubbling.
- Add heat: Toss in sliced pickled jalapeños or a few cherry peppers with the vegetables.
- Stuffed peppers: Spoon the filling into halved green bell peppers, top with provolone, and bake 25 minutes.
- Lighter version: Use sirloin and replace the heavy cream with unsweetened almond milk.
Storage, Leftovers, and Serving
Store cooled squares in airtight containers in the fridge for up to 4 days. They’re sturdy enough to pack for lunch.
Reheat in a 350°F oven for 10 to 15 minutes or in the microwave for 1 to 2 minutes. The air fryer at 350°F for 5 minutes brings back the crisp cheese on top.
Serve with a simple salad or roasted broccoli. For more comfort-food dinners, browse my keto dinner recipes.
Frequently Asked Questions
What Cut of Steak Is Best for a Cheesesteak Casserole?
Ribeye is the classic choice because its fat keeps thin slices juicy and tender. Sirloin or flank steak also work and cost less. Whatever cut you use, slice it very thin against the grain.
Is This Philly Cheesesteak Casserole Keto?
Yes. A serving has about 5 g net carbs, 47 g protein, and 50 g fat. Leaving out the roll removes nearly all the carbs from a traditional cheesesteak, and the vegetables add only a few grams.
Can I Assemble This Casserole Ahead?
You can sear the steak and vegetables up to 2 days ahead and keep them in the fridge. On the day you bake, whisk the custard, pour it over the cold filling, top with provolone, and add about 5 minutes to the bake time.
Your This-Week Plan
Here’s the experiment: the next time a sandwich or takeout craving hits this week, make this casserole instead and portion it into six squares. Notice whether the craving was really about the bread or about the steak and cheese. Most people discover it was never the roll.
This recipe is for general education, not medical advice. Nutrition values are estimates and will vary with brands. If you’re pregnant, have a health condition, or take medication for blood sugar or blood pressure, check with your doctor before starting keto.
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