Philly Cheesesteak Casserole – All the Flavor, None of the Bread

If you’ve ever craved a Philly cheesesteak but didn’t want the mess or the carbs, you’re going to love this. This casserole is my cheesy, cozy twist on the iconic sandwich — all the savory beef, sweet onions, and melty cheese you adore, baked into a spoonable, family-sized dish.

It’s low-carb, gluten-free, meal-prep friendly… and so good you might not miss the bread at all.

💫 What Is Philly Cheesesteak Casserole?

It’s all the classic flavors of a Philly cheesesteak — thin-sliced beef, caramelized onions, sautéed peppers, mushrooms, and gooey cheese — baked together into a bubbly, golden, breadless masterpiece. Think comfort food meets weeknight convenience.

💖 Why You’ll Love This Recipe

Low-carb & keto-friendly – No bread needed.
Melty, gooey cheese in every bite – The ultimate comfort factor.
One-pan cooking – Easy cleanup.
Customizable – Switch up meats, veggies, or cheeses.
Meal-prep friendly – Tastes just as good reheated.

🧀 What It Tastes Like

Tender, savory beef with sweet caramelized onions, juicy peppers, and earthy mushrooms, all hugged by a creamy, cheesy sauce that bakes until golden and bubbling. It’s rich, comforting, and every bite tastes like the best part of the sandwich.

🌟 Health & Practical Benefits

Low-carb, high-protein – Ideal for keto or low-carb lifestyles.
Gluten-free – Naturally breadless.
Make-ahead friendly – Perfect for batch cooking.
Versatile – Swap veggies, cheeses, or even the protein.

🛒 Ingredients

For the Casserole:

1.5 lbs thinly sliced beef (ribeye, sirloin, or deli roast beef)
1 tbsp olive oil
1 onion, thinly sliced
1 green bell pepper, thinly sliced
8 oz mushrooms, sliced
8 oz cream cheese, softened
½ cup mayonnaise
1 cup shredded provolone cheese
1 cup shredded mozzarella cheese
¼ cup grated Parmesan cheese
1 tsp salt
½ tsp black pepper

For the Seasoning Mix:

1 tsp garlic powder
1 tsp onion powder
1 tsp dried oregano
1 tsp dried basil
½ tsp red pepper flakes (optional)
Salt & pepper, to taste

🧰 Tools You’ll Need

Large skillet
9×13-inch baking dish
Mixing bowls (medium & small)
Spatula or wooden spoon

🧩 Ingredient Swaps & Add-Ins

Meat – Ground beef instead of steak for a budget-friendly twist.
Veggies – Add jalapeños for heat, spinach for extra greens.
Cheese – Swap in Swiss, cheddar, or pepper jack.
Non-low-carb version – Add a bottom layer of toasted hoagie rolls for a baked sandwich.

👩‍🍳 How to Make It

Preheat Oven to 375°F (190°C).
Cook Beef & Veggies – Heat olive oil in a skillet. Sauté onions, peppers, and mushrooms until softened. Add beef and cook until just browned. Drain excess liquid.
Mix Cheese Base – In a bowl, combine cream cheese, mayonnaise, half the provolone, half the mozzarella, Parmesan, and seasoning mix.
Assemble Casserole – Spread beef & veggie mixture in the baking dish. Top with the cheese mixture. Sprinkle remaining cheeses on top.
Bake for 20–25 minutes, until golden and bubbly.
Serve Hot – Scoop onto plates or bowls and enjoy!

🍴 Storage Tip

Store leftovers in an airtight container in the fridge for up to 4 days or freeze for up to 2 months. Reheat in the oven for best results.

This casserole delivers everything you love about a Philly cheesesteak — just in a fork-friendly, weeknight-ready form.

If you’d like, I can also make a Pinterest-optimized recipe card for this that includes a vertical image and condensed instructions so it’s shareable and search-friendly. Would you like me to do that next?