If you’re craving the classic flavors of a Philly cheesesteak but want to keep it low-carb and hassle-free, this Keto Philly Cheesesteak Casserole Recipe is an absolute game changer. It brings together tender, thinly sliced roast beef with a vibrant mix of colorful bell peppers, sweet onions, earthy mushrooms, and fragrant garlic, all smothered in gooey provolone and mozzarella cheese. Ready in under 30 minutes and baked to bubbly perfection, this casserole is comfort food that fits perfectly into your keto lifestyle, making weeknight dinners something to look forward to.
Ingredients You’ll Need
These ingredients are simple yet essential; each contributes to the bold flavor profile, varied textures, and beautiful color that make this dish a standout. From the freshness of the bell peppers to the meltiness of the cheeses, let’s break down what you’ll need.
- 1 large green bell pepper: Adds a crisp texture and grassy freshness that balances richness.
- 1 large yellow bell pepper: Brings a mild sweetness and sunny color contrast.
- 1 large red bell pepper: Offers a natural sweetness and vibrant hue to make the casserole pop.
- 2 tablespoons salted butter: Creates a luscious base to sauté the vegetables, infusing richness.
- 1 small onion, thinly sliced (about ½ cup): Adds subtle sweetness and depth when softened.
- 3 cloves garlic, minced: Imparts aromatic warmth that elevates all the other ingredients.
- 8 ounces cremini mushrooms, thinly sliced: Give an earthy flavor and meaty texture to enrich the casserole.
- 1 ½ pounds deli-style roast beef, thinly sliced: The star protein, tender and flavorful, providing authentic Philly cheesesteak goodness.
- 6 slices provolone cheese (about 6 ounces): Melts beautifully, layering creamy, slightly smoky notes.
- 1 cup shredded mozzarella cheese: Tops the dish with gooey stretchiness and a golden finish.
How to Make Keto Philly Cheesesteak Casserole Recipe
Step 1: Prepare the Peppers
Start by cutting the tops off your green, yellow, and red bell peppers, removing the ribs and seeds for a clean bite, then slicing them thinly. These peppers will add that classic Philly cheesesteak crunch and bursts of sweetness.
Step 2: Sauté the Aromatics
Heat the salted butter in a large, deep-sided ovenproof skillet or a Dutch oven over medium-low heat. Toss in the thinly sliced onion and minced garlic, cooking gently until the onions become translucent and the garlic releases its fragrant aroma, about 7 minutes. This step builds the flavorful foundation for your casserole.
Step 3: Cook the Mushrooms and Peppers
Add the thinly sliced cremini mushrooms and prepared bell peppers to your skillet. Cook everything together until the mushrooms release their natural moisture and the peppers turn tender-crisp, around 10 minutes. This blend develops a savory vegetable medley that complements the juicy roast beef perfectly.
Step 4: Combine Roast Beef and Vegetables
Preheat your oven to 350°F. Then, stir the thinly sliced deli-style roast beef into the vegetable mixture, blending the flavors evenly. Taste and season with salt and pepper if needed. This step unites all the ingredients before the cheese goes on.
Step 5: Add the Cheeses and Bake
Layer the provolone slices evenly over the roast beef and veggie mixture, then sprinkle shredded mozzarella cheese across the top. Place your skillet or Dutch oven in the oven and bake for 15 minutes. To finish, switch to the broiler and let the cheese brown and bubble to irresistible perfection for 2 to 3 minutes.
How to Serve Keto Philly Cheesesteak Casserole Recipe
Garnishes
Fresh herbs like chopped parsley or chives can brighten up the rich casserole with a pop of color and mild herbaceous notes. For added heat, consider sprinkling a little crushed red pepper or serving with pickled jalapeños on the side for that extra kick.
Side Dishes
This casserole pairs wonderfully with simple keto-friendly sides to balance the meal. A crisp green salad with lemon vinaigrette or roasted garlic cauliflower mash complements the creamy cheesesteak flavors without overpowering them.
Creative Ways to Present
For a fun twist, serve this casserole in individual ramekins for portion control and impressive presentation. Alternatively, top with a fried egg for brunch or add sliced avocado on the side to elevate the creamy, rich texture experience.
Make Ahead and Storage
Storing Leftovers
Store any leftover Keto Philly Cheesesteak Casserole Recipe in an airtight container in the refrigerator for up to three days. This allows you to easily enjoy a hearty, flavorful meal without extra cooking during busy days.
Freezing
You can freeze the casserole for up to one month. Portion it into freezer-safe containers before baking or after it has fully cooled to maintain fresh flavors and ensure an easy grab-and-go dinner option.
Reheating
To reheat, warm individual portions in the microwave until heated through or pop the casserole in a 350°F oven for 15-20 minutes until bubbly. If frozen, thaw overnight in the fridge before reheating for best texture and flavor.
FAQs
Can I use different types of cheese in this casserole?
Absolutely! While provolone and mozzarella give the classic Philly flavor, sharp cheddar or pepper jack can add a fun twist. Just pick cheeses that melt well to maintain that creamy texture.
Is this recipe suitable for a gluten-free diet?
Yes, this Keto Philly Cheesesteak Casserole Recipe is naturally gluten-free, making it a perfect option for those avoiding gluten without sacrificing flavor.
Can I substitute the roast beef with another protein?
Definitely! Thinly sliced chicken or turkey breast works well, and for a beefier bite, you could use ground beef, though the texture will be different from the traditional slices.
How can I make this recipe spicier?
Adding sliced jalapeños to the vegetable medley, using pepper jack cheese, or topping with hot sauce after baking can give the casserole a nice spicy kick.
Is this casserole keto-friendly?
Yes, the Keto Philly Cheesesteak Casserole Recipe is designed to be low in carbs and rich in protein and fats, making it ideal for anyone following a ketogenic lifestyle.
Final Thoughts
There’s nothing quite like the satisfying comfort of a cheesy, meaty casserole that fits perfectly into your keto lifestyle. The Keto Philly Cheesesteak Casserole Recipe is an easy, vibrant, and delicious way to enjoy all the flavors you love from a Philly cheesesteak without the carbs or fuss. Give it a try on your next cozy night in—you might just find your new favorite weeknight dinner!
Print
Keto Philly Cheesesteak Casserole Recipe
This Keto Philly Cheesesteak Casserole is a delicious, low-carb twist on the classic sandwich, featuring tender roast beef, sautéed bell peppers, onions, and mushrooms, all topped with melted provolone and mozzarella cheeses. Ready in under 45 minutes and cooked in one pan, this casserole is a perfect easy and hearty weeknight dinner that satisfies cravings without the bread.
- Total Time: 45 minutes
- Yield: 6 servings
Ingredients
Vegetables
- 1 large green bell pepper
- 1 large yellow bell pepper
- 1 large red bell pepper
- 1 small onion, thinly sliced (about ½ cup)
- 3 cloves garlic, minced
- 8 ounces cremini mushrooms, thinly sliced
Dairy & Meat
- 2 tablespoons salted butter
- 1 ½ pounds deli-style roast beef, thinly sliced
- 6 slices provolone cheese (about 6 ounces)
- 1 cup shredded mozzarella cheese
Instructions
- Prepare the peppers: Cut the tops off the green, yellow, and red bell peppers, remove the ribs and seeds, then thinly slice the peppers. Set aside for cooking.
- Sauté onions and garlic: Heat 2 tablespoons of salted butter in a large deep-sided ovenproof skillet or Dutch oven over medium-low heat. Add the thinly sliced onion and minced garlic, cook until the onion becomes translucent and the garlic is fragrant, approximately 7 minutes.
- Cook vegetables: Add the sliced mushrooms and prepared bell peppers to the skillet. Cook the mixture until the mushrooms release their liquid and the peppers become crisp-tender, about 10 minutes.
- Preheat oven: While the vegetables cook, preheat your oven to 350°F (175°C).
- Combine roast beef and vegetables: Add the thinly sliced deli-style roast beef into the skillet with the sautéed vegetables. Stir to combine and taste; season with salt and pepper if needed.
- Add cheese toppings: Layer the 6 slices of provolone cheese evenly over the roast beef and vegetable mixture. Then sprinkle the shredded mozzarella cheese uniformly on top.
- Bake and broil: Place the skillet in the preheated oven and bake for 15 minutes. After baking, switch the oven to broil and cook for an additional 2 to 3 minutes, or until the cheese is browned and bubbling.
Notes
- For a spicier twist, add sliced jalapeños or red pepper flakes with the vegetables.
- Use a well-seasoned cast iron skillet for best results and oven safety.
- Ensure to thinly slice the roast beef to allow it to warm through evenly.
- Leftovers can be stored in an airtight container in the refrigerator for up to 3 days.
- Reheat in the oven or microwave until warmed through before serving.
- Prep Time: 15 minutes
- Cook Time: 30 minutes
- Category: Casserole
- Method: Baking
- Cuisine: American
- Diet: Gluten Free
