Philly Cheesesteak Casserole: A Cheesy, Comforting Dinner Everyone Will Love

If you love the flavors of a classic Philly cheesesteak but want something easy enough for a weeknight dinner, this Philly Cheesesteak Casserole is the perfect answer. It takes all the familiar ingredients—savory ground beef, tender onions, sweet bell peppers, mushrooms, and plenty of melted cheese—and brings them together in one hearty, oven-baked dish.

Instead of assembling individual sandwiches, everything is cooked together and finished under a blanket of gooey cheese. The result is a satisfying casserole with rich beefy flavor, tender vegetables, and golden, bubbling cheese in every bite.

It is simple enough for a busy evening but comforting enough to serve when you have family or friends around the table.

Why You’ll Love This Philly Cheesesteak Casserole

This casserole has everything that makes a cheesesteak so comforting without requiring a stack of hoagie rolls.

• Easy to prepare: Most of the cooking happens in one skillet before the casserole goes into the oven.
• Packed with flavor: Caramelized onions, peppers, mushrooms, and seasoned beef create a savory filling.
• Extra cheesy: Provolone gives it that classic cheesesteak flavor, while mozzarella adds plenty of stretch and melt.
• Family-friendly: The ingredients are familiar and easy to customize.
• Great for leftovers: The casserole reheats well, making it useful for lunches or another dinner.

Ingredients

For the Beef Filling

• 1 ½ pounds ground beef
• 1 medium yellow onion, thinly sliced
• 1 green bell pepper, thinly sliced
• 1 red bell pepper, thinly sliced
• 8 ounces mushrooms, sliced
• 2 cloves garlic, minced
• 1 tablespoon Worcestershire sauce
• 1 teaspoon salt
• ½ teaspoon black pepper
• ½ teaspoon Italian seasoning
• 1 tablespoon olive oil, if needed

For the Creamy Mixture

• 4 ounces cream cheese, softened
• ½ cup sour cream
• ½ cup beef broth
• 1 tablespoon Dijon mustard

For the Casserole

• 3 cups cooked egg noodles or cooked rice
• 1 ½ cups shredded mozzarella cheese
• 6 slices provolone cheese, torn into smaller pieces
• 2 tablespoons grated Parmesan cheese
• 2 tablespoons chopped fresh parsley, optional

How to Make Philly Cheesesteak Casserole

Step 1: Prepare the Oven and Baking Dish

Preheat your oven to 375°F (190°C).

Lightly grease a 9-by-13-inch baking dish and set it aside. Preparing the dish first makes it easier to transfer the finished filling once everything is cooked.

Step 2: Brown the Ground Beef

Place a large skillet over medium-high heat. Add the ground beef and cook for about 6–8 minutes, breaking it apart with a wooden spoon as it cooks.

Continue cooking until the beef is browned and no longer pink. If there is a large amount of excess grease in the skillet, carefully drain it.

Return the skillet to the stove.

Step 3: Cook the Vegetables

Add the sliced onion, green bell pepper, red bell pepper, and mushrooms to the skillet.

Cook everything together for approximately 7–10 minutes, stirring occasionally. The vegetables should become tender and the onions should begin to turn lightly golden.

If the skillet seems dry, add a small amount of olive oil.

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