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Instructions
Preheat the Oven
Preheat your oven to 375°F (190°C). Grease a 9×13-inch baking dish and set aside.
Cook the Beef
In a large skillet over medium-high heat, heat the olive oil. Add the thinly sliced beef and cook until browned and no longer pink. Season with salt and pepper. Remove from skillet and set aside.
Sauté the Vegetables
In the same skillet, sauté the onions, bell pepper, and mushrooms until tender and lightly caramelized (5–7 minutes). Remove from heat.
Make the Cheese Mixture
In a medium bowl, combine cream cheese and mayonnaise. Stir in Parmesan, and half of the provolone and mozzarella cheeses. Mix until smooth and creamy.
Prepare the Seasoning
In a small bowl, mix together garlic powder, onion powder, oregano, basil, red pepper flakes, and a pinch of salt and pepper.
Assemble the Casserole
Layer half of the cooked beef in the bottom of the baking dish.
Sprinkle half the seasoning mix over the beef.
Top with the sautéed veggies.
Spread the creamy cheese mixture evenly over the vegetables.
Add the remaining beef, sprinkle with the rest of the seasoning mix.
Finish by topping with the remaining shredded cheeses.
Bake
Bake uncovered for 25–30 minutes, or until the cheese is melted, bubbly, and golden brown on top.
Rest & Serve
Let the casserole rest for 5–10 minutes before slicing. Serve hot.
Optional Variations
Low-Carb/Keto-Friendly: This recipe is naturally low in carbs. Make it even lighter by skipping the mayo and using more cream cheese.
Add Bread Layer (Not Low-Carb): For a sandwich feel, line the bottom with lightly toasted hoagie rolls or slices of crusty bread.
Switch the Meat: Use ground beef for a more budget-friendly option or leftover roast beef for extra flavor.
Cheese Swap: Try cheddar, Swiss, pepper jack, or a cheese blend for a new flavor profile.
Serving Suggestions
Serve with a crisp green salad or roasted vegetables.
Spoon over cooked rice, cauliflower rice, or mashed potatoes.
For a party version, scoop into hoagie rolls and serve as cheesy Philly steak sliders!
Why You’ll Love This Casserole
Packed with savory, melty cheese
Easy to customize with your favorite ingredients
One-pan, family-approved dinner
A low-carb alternative to the sandwich without sacrificing flavor
This Philly Cheesesteak Casserole transforms a street-food favorite into a cozy, oven-baked meal everyone at the table will love. Whether you’re making it for a weeknight dinner or prepping it ahead for guests, it’s a delicious way to satisfy your cheesesteak craving—no grill required!
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