Philly Cheesesteak Casserole: A Cheesy, Comforting Twist on the Classic Sandwich

Philly Cheesesteak Casserole brings all the beloved flavors of the famous Philadelphia cheesesteak sandwich into a warm, satisfying baked dish. Instead of being served inside a roll, the tender beef, caramelized onions, sautéed peppers, creamy sauce, and melted cheese are layered together in a casserole that is perfect for family dinners, meal prep, or a cozy weekend meal.

This recipe captures the heart of the original cheesesteak: savory beef, sweet onions, flavorful peppers, and plenty of cheese. It is easy to prepare, filling, and delivers the same comforting taste with a homemade casserole style.

What Makes Philly Cheesesteak Casserole Special?

Traditional Philly cheesesteaks are known for their simple but powerful combination of thinly sliced beef, onions, peppers, and cheese. This casserole keeps those signature flavors but adds a creamy texture and a baked cheesy topping.

The best part is its versatility. You can serve it as a complete meal, pair it with a salad, spoon it over pasta or rice, or enjoy it with toasted bread to recreate the sandwich experience.

Ingredients

For the Beef Mixture

• 1 ½ pounds thinly sliced steak (ribeye, sirloin, or shaved beef)
• 2 tablespoons olive oil
• 1 large onion, thinly sliced
• 1 green bell pepper, sliced
• 1 red bell pepper, sliced
• 3 cloves garlic, minced
• 1 teaspoon salt
• ½ teaspoon black pepper
• 1 teaspoon Worcestershire sauce
• ½ teaspoon smoked paprika (optional)

For the Creamy Casserole Base

• 8 ounces cream cheese, softened
• ½ cup sour cream
• ½ cup beef broth
• 1 teaspoon garlic powder
• ½ teaspoon onion powder

For the Cheese Layer

• 1 ½ cups shredded provolone cheese
• 1 cup shredded mozzarella cheese
• ½ cup shredded cheddar cheese (optional)

Optional Additions

• Mushrooms, sliced
• Cooked pasta
• Cauliflower rice for a low-carb version
• Fresh parsley for garnish
• Red pepper flakes for heat

Step 1: Prepare the Ingredients

Begin by preparing all the vegetables and meat.

Slice the onions and peppers into thin strips. Thin slices cook faster and create the soft texture associated with a traditional cheesesteak.

If using steak, slice it as thinly as possible. Ribeye is the classic choice because it has rich flavor and tenderness, but sirloin or shaved beef also works well.

Allow the cream cheese to soften at room temperature so it mixes easily later.

Step 2: Cook the Steak

Heat a large skillet over medium-high heat.

Add olive oil, then add the sliced steak.

Cook quickly, stirring occasionally, until the beef is browned and cooked through. Avoid overcrowding the pan because too much meat at once can cause steaming instead of browning.

Season the steak with salt, black pepper, and Worcestershire sauce.

Once cooked, remove the steak from the skillet and set it aside.

Keeping the cooked beef separate prevents it from becoming overcooked while preparing the vegetables.

Step 3: Sauté the Vegetables

Using the same skillet, add the sliced onions and peppers.

Cook for 5 to 7 minutes until they become soft and slightly caramelized.

The onions should develop a golden color, which brings natural sweetness to the dish.

Add the minced garlic and cook for another 30 seconds until fragrant.

If you are adding mushrooms, this is the time to cook them with the peppers and onions.

Step 4: Prepare the Creamy Sauce

In a mixing bowl, combine:

• softened cream cheese
• sour cream
• beef broth
• garlic powder
• onion powder

Whisk until smooth and creamy.

This mixture creates a rich sauce that coats the beef and vegetables while keeping the casserole moist.

If the sauce feels too thick, add a little more beef broth until it reaches a smooth consistency.

Step 5: Combine the Filling

Return the cooked steak to the skillet with the vegetables.

Stir everything together so the beef, onions, and peppers are evenly distributed.

Pour the creamy sauce over the mixture and gently stir until everything is coated.

Allow the mixture to cook for 2 to 3 minutes over low heat. This allows the flavors to blend together.

Taste and adjust seasoning if needed.

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