Philly Cheesesteak Casserole Recipe

If you adore classic Philly cheesesteak flavors but crave something a little more comforting and shareable, this Philly Cheesesteak Casserole is pure weeknight magic. Juicy roast beef, a generous heap of colorful peppers, sautéed mushrooms, and golden, bubbly cheese – all packed into one irresistible dish. It’s everything you love about the beloved sandwich, but in a cheesy, fork-ready casserole the whole family will request again and again!

Ingredients You’ll Need

This Philly Cheesesteak Casserole uses wholesome, everyday ingredients, but each one plays a starring role in creating layers of savory, melty flavor. Don’t skip any — together, they build the bold, comforting essence that makes this dish irresistible!

• Green, Yellow, & Red Bell Peppers: These trio of peppers add sweetness, color, and that signature cheesesteak crunch.
• Salted Butter: A little goes a long way to bring out the natural flavors of the veggies and ensure they sauté beautifully.
• Onion: Sliced thin and cooked low-and-slow, onion adds sweetness and depth, just like in a classic cheesesteak.
• Garlic: Just a few cloves, but they perfume the whole dish with mouthwatering aroma.
• Cremini Mushrooms: Their earthy, meaty texture gives the casserole extra heartiness and a lovely bite.
• Deli-Style Roast Beef: Ultra-thin slices soak up all the juices and mimic that authentic Philly cheesesteak feel—so easy!
• Provolone Cheese Slices: Melts into puddles of rich, creamy goodness over the top for that unmistakable cheesesteak finish.
• Shredded Mozzarella Cheese: Adds extra stretch and golden, bubbling perfection once baked and broiled.

Variations

I absolutely love how customizable this Philly Cheesesteak Casserole is! Feel free to give it your own spin—adapt it according to what’s in your fridge, personal cravings, or dietary goals. Let’s make it your family’s go-to, your way.

• Use Ground Beef: Swap out deli roast beef for browned ground beef for a budget-friendly version with classic flavor and a little extra richness.
• Go Low-Dairy: Try using dairy-free mozzarella and provolone alternatives for a cheesy bake that suits a dairy-sensitive crowd.
• Add Hot Peppers: For a spicy kick, toss a few thinly sliced jalapeños into the veggie mix or sprinkle red chili flakes over the cheese.
• Make It Even Meatier: Ribeye steak, thinly sliced, delivers a classic cheesesteak flavor and an irresistibly juicy texture if you want to splurge a little.
• Keto-Twist: Already low-carb, but amp up the protein by adding more beef or switching to a higher fat cheese.

How to Make Philly Cheesesteak Casserole

Step 1: Prep and Slice the Veggies

Start by slicing the tops off all three bell peppers. Remove the ribs and seeds, then cut the peppers into beautiful thin strips—their color will make your casserole really pop! Do the same with the onion and mushrooms. Mince your garlic so it’s ready when you need it. Having everything prepped and organized before you begin cooking makes this whole recipe a stress-free affair.

Step 2: Sauté the Onion and Garlic

In a large, deep-sided skillet or Dutch oven over medium-low heat, melt the salted butter. Add the sliced onion and minced garlic. Stir gently, letting the onion sweat and become translucent. This should take about 7 minutes—the aromas will have everyone peeking into your kitchen! It’s so worth giving the onions a little time to mellow and sweeten.

Step 3: Cook the Peppers and Mushrooms

To your aromatic onion mix, toss in those rainbow-hued bell peppers and sliced cremini mushrooms. Let everything sauté together until the mushrooms release their juices and the peppers are tender but still vibrant—about 10 minutes. Stir occasionally to keep things moving and prevent sticking. The veggies should smell irresistible and look super colorful!

Step 4: Add Beef and Cheese, Then Bake

Preheat your oven to 350°F. Stir the thinly sliced roast beef into your veggie mixture, coating everything so the flavors meld. Taste and season with salt and pepper, if you’d like. Next, lay the provolone slices evenly over the top, then sprinkle with shredded mozzarella. This is the moment things start to look seriously mouthwatering!

Step 5: Bake and Broil Till Golden

Transfer the whole skillet to your preheated oven and bake uncovered for 15 minutes. When the cheese is melted and starting to bubble, switch to your oven’s broiler for 2 to 3 minutes. Watch closely—the top should turn golden and bubbly but not burn. The aroma of Philly Cheesesteak Casserole at this stage is legendary. Let it cool slightly before serving straight from the skillet.

How to Serve Philly Cheesesteak Casserole

Garnishes

This casserole is delicious as-is, but a sprinkle of fresh chopped parsley, some sliced green onions, or even a drizzle of hot sauce really brightens up every cheesy bite. If you love the authentic Philly touch, serve with a few crunchy pickle spears on the side for a little zing!

Side Dishes

Since Philly Cheesesteak Casserole is hearty and rich, I love pairing it with something light—think simple green salads with vinegar or lemon dressing, roasted asparagus, or even crisp cucumber slices to cut through the cheese. For kids and carb-lovers, warm rolls or garlic bread are always a hit for scooping up melty bites.

Creative Ways to Present

This dish shines straight from the skillet for a rustic, family-style presentation. For fun gatherings, spoon casserole filling into halved hollowed-out rolls for mini “cheesesteak boats.” Or, let everyone build their own bowls with extra toppings like jalapeños, olives, or even sliced avocado for a fresh twist.

Make Ahead and Storage

Storing Leftovers

Any leftovers can be covered and tucked into the refrigerator for up to 5 days. The flavors mingle even more as it sits, so the next-day leftovers are just as crave-worthy—sometimes even better!

Freezing

To freeze Philly Cheesesteak Casserole, let it cool completely, then transfer portions to airtight containers or wrap the entire dish tightly in foil. Freeze up to 2 months. Thaw overnight in the fridge for best results before reheating.

Reheating

For melty cheese and best flavor, reheat portions in a covered oven-safe dish at 325°F, or gently on the stovetop over low heat, adding a splash of broth if needed. Microwave works in a pinch, but the cheese won’t be quite as luscious.

FAQs

Final Thoughts

If you’re searching for a feel-good, family-loved dinner that captures all the fun of a Philly cheesesteak in a cozy, melty casserole—look no further. This recipe is true comfort, made for sharing. I hope you give this Philly Cheesesteak Casserole a try soon (and watch it disappear in a flash!). Enjoy every gooey, cheesy bite!

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