Philly Cheesesteak Casserole Recipe

This Philly Cheesesteak Casserole is savory, cheesy comfort food in every forkful! Bursting with colorful peppers, tender roast beef, and layers of bubbling provolone and mozzarella, it captures all the flavor of the classic sandwich—no bread required. If you’re craving a crowd-pleasing weeknight dinner that comes together fast and satisfies everyone at the table, this casserole delivers big time.

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Ingredients You’ll Need

The best part about Philly Cheesesteak Casserole? The ingredient list is straightforward, but each item brings something essential—color from the peppers, richness from the cheeses, savory depth from the beef. These classic flavors mingle beautifully and make every bite irresistible.

• Green, Yellow, and Red Bell Peppers: These add juicy sweetness, a pop of color, and that signature cheesesteak crunch.
• Salted Butter: Gives everything a glossy, luscious finish and delivers extra flavor to those sautéed onions and veggies.
• Onion: Thinly sliced for sweetness and classic cheesesteak depth; don’t skip this for truly authentic flavor.
• Garlic: A dash of real garlic boosts the aroma and brings warm, comforting notes to the casserole base.
• Cremini Mushrooms: These earthy mushrooms soak up flavor and add a satisfying meatiness (even picky eaters usually gobble them up post-bake!).
• Deli-Style Roast Beef: The quick-and-easy way to get savory, tender protein without extra cooking; thin slices meld beautifully into each layer.
• Provolone Cheese: Melty and mild, provolone is classic in cheesesteaks and gives the casserole its signature pull and top layer.
• Shredded Mozzarella Cheese: Adds gooeyness and creates those irresistible golden-bubbled cheese pockets every casserole dreams about.

Variations

One of the best things about Philly Cheesesteak Casserole is how easy it is to make it your own. Feel free to adapt based on what you have, your dietary needs, or just what you’re in the mood for tonight!

• Switch Up the Protein: Try thinly sliced ribeye, cooked ground beef, or even leftover steak—each brings its own magic.
• Go Cheese Crazy: Swap in sliced American, Monterey Jack, or pepper jack for a different flavor vibe.
• Add a Crunchy Topping: Scatter crispy fried onions or a handful of keto-friendly breadcrumbs over the top before broiling for irresistible texture.
• No Mushrooms Needed: If you’re not a mushroom fan, simply skip them or add extra peppers for more crunch and juiciness.

How to Make Philly Cheesesteak Casserole

Step 1: Prep the Peppers

Slice the tops off your bell peppers, remove their seeds and ribs, and thinly slice them into strips. Laying out a rainbow of peppers not only makes your casserole beautiful, but ensures each bite is sweet, crunchy, and vibrant.

Step 2: Sauté the Aromatics

In your favorite large, oven-safe skillet, melt the butter over medium-low heat. Add the onions and garlic, letting them sizzle gently until the onion turns soft and translucent, and your kitchen starts smelling incredible—about 7 minutes is perfect.

Step 3: Cook the Veggies

Toss in the mushrooms and your beautiful sliced peppers. Cook everything together, stirring occasionally, until the mushrooms have released their juices and the peppers are just crisp-tender—about 10 minutes. You want the veggies to keep a little bite for that classic cheesesteak texture.

Step 4: Mix in the Beef

Add the sliced roast beef right into the skillet and mix until it’s blended with the veggies. Taste and season with a little salt and pepper if you like—it’s all about building layered flavor in every bite.

Step 5: Add Cheese and Bake

Lay the provolone slices evenly over everything, then sprinkle with mozzarella for even more gooeyness. Pop your skillet in the oven at 350°F and bake for 15 minutes. Finally, finish under the broiler for 2–3 minutes until the cheese is bubbly and golden-brown magic happens!

How to Serve Philly Cheesesteak Casserole

Garnishes

A sprinkle of fresh chopped parsley adds lovely color contrast and freshness right before serving. If you want it extra authentic, try finely diced pickles or thinly sliced scallions for a little zing to balance all that cheesy richness.

Side Dishes

This casserole is rich and filling on its own, but it loves a fresh side salad—think crisp greens with a bright vinaigrette. For something classic, pair with oven-roasted potatoes or serve over fluffy cauliflower rice for a low-carb twist.

Creative Ways to Present

Spoon Philly Cheesesteak Casserole into mini cast iron skillets for personal “skillet pies,” or heap it onto toasted hoagie rolls for a fork-and-knife experience. For gatherings, serve with crunchy crostini or low-carb wraps and let guests build their perfect bite.

Make Ahead and Storage

Storing Leftovers

Let any leftover Philly Cheesesteak Casserole cool to room temperature, then wrap tightly or transfer to an airtight container. It’ll keep beautifully in the fridge for up to 5 days, making it perfect for meal prep or easy lunches all week.

Freezing

This casserole actually freezes well! Cool it completely, then cover tightly with foil or plastic wrap. Freeze for up to 2 months. Thaw overnight in the fridge before reheating for best texture.

Reheating

Reheat leftovers in the oven for 15–20 minutes at 350°F, or warm individual servings in a skillet on the stove. This keeps the cheese bubbly and the veggies just right—avoid microwaving if you want to preserve that fresh-from-the-oven feel!

FAQs

Final Thoughts

If you’re looking for a quick, crowd-pleasing dinner that’s big on comfort and loaded with flavor, this Philly Cheesesteak Casserole is always a winner. It’s warm, melty, and endlessly adaptable—so grab your skillet, gather your favorite people, and get ready to dig in. Enjoy every cheesy, meaty bite!

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