Philly Cheesesteak Casserole: A Cheesy, Comforting Dinner the Whole Family Will Love

If you love the rich, savory flavors of a classic Philly cheesesteak sandwich, this Philly Cheesesteak Casserole is a delicious way to enjoy those same flavors in a warm, satisfying dinner. Made with tender beef, sweet sautéed onions, colorful bell peppers, melted cheese, and a creamy, flavorful sauce, this casserole brings everything together in one convenient baking dish.

Unlike traditional cheesesteaks served inside a toasted hoagie roll, this casserole transforms the familiar combination of beef, peppers, onions, and cheese into a hearty meal that is easy to prepare and perfect for sharing. It is an excellent choice for busy weeknights, casual family dinners, or meal preparation when you want something filling without spending hours in the kitchen.

The best part is how simple the recipe is to customize. You can use thinly sliced steak or ground beef, choose your favorite cheese, and add mushrooms or other vegetables to suit your taste. Once everything is assembled, the oven does most of the work, allowing the flavors to blend together while the cheese melts into a delicious golden topping.

Why You Will Love This Philly Cheesesteak Casserole

This recipe combines the comforting qualities of a homemade casserole with the unmistakable flavor of a Philly cheesesteak.

• Rich and cheesy: Melted provolone and mozzarella create a creamy, stretchy cheese topping.

• Packed with flavor: Beef, onions, bell peppers, garlic, and seasonings provide a savory base.

• Easy to prepare: Simple ingredients and straightforward steps make this recipe approachable, even for beginner cooks.

• Perfect for family dinners: The casserole can be served directly from the baking dish, making mealtime easy.

• Customizable: You can change the vegetables, cheese, or type of beef depending on what you have available.

Ingredients You Will Need

This recipe serves approximately 6 people and takes about 15–20 minutes to prepare, followed by 20–25 minutes of baking.

For the Casserole

• 1 ½ pounds thinly sliced beef steak or lean ground beef

• 1 medium yellow onion, thinly sliced

• 2 medium bell peppers, preferably one green and one red, thinly sliced

• 2 cloves garlic, minced

• 8 ounces cream cheese, softened

• ½ cup beef broth

• 1 tablespoon Worcestershire sauce

• 1 tablespoon olive oil

• 1 teaspoon paprika

• ½ teaspoon dried Italian seasoning

• ½ teaspoon salt, or to taste

• ½ teaspoon ground black pepper

• 1 cup shredded mozzarella cheese

• 1 cup shredded provolone cheese

Optional Ingredients

• 1 cup sliced mushrooms

• ¼ teaspoon crushed red pepper flakes for a little heat

• ½ cup shredded cheddar cheese for a sharper flavor

• Fresh chopped parsley for garnish

Step-by-Step Instructions

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 with cooking spray or a small amount of olive oil. Set the dish aside while you prepare the filling.

If you are using steak, slice it into thin strips against the grain. Thin slices help the beef cook quickly and remain tender. If you prefer ground beef, simply have it ready to brown in the skillet.

Prepare the onion, bell peppers, and garlic by slicing or chopping them as directed. Having all the ingredients ready before cooking makes the process easier and helps prevent overcooking.

Step 2: Brown the Beef

Heat the olive oil in a large skillet over medium-high heat.

If you are using thinly sliced steak, add it to the hot skillet in batches if necessary. Avoid overcrowding the pan, as too much meat at once can cause it to steam instead of brown. Cook the steak until browned and nearly cooked through, stirring occasionally.

If you are using ground beef, break it apart with a wooden spoon and cook until thoroughly browned, with no pink remaining. Drain excess grease if necessary.

Season the beef with salt, black pepper, paprika, and dried Italian seasoning. Add the Worcestershire sauce and stir well to coat the meat.

Transfer the cooked beef to a plate and set it aside. Leave a little of the flavorful cooking liquid in the skillet to help season the vegetables.

Step 3: Sauté the Onions and Bell Peppers

Using the same skillet, add the sliced onions and bell peppers. If the pan looks dry, add a small drizzle of olive oil.

Cook the vegetables over medium heat for approximately 5–7 minutes, stirring occasionally. The onions should become soft and slightly translucent, while the peppers should soften without completely losing their texture.

Add the minced garlic during the final minute of cooking. Stir continuously so the garlic releases its aroma without burning.

If you are adding mushrooms, cook them alongside the onions and peppers until they release their moisture and begin to brown.

This step is important because sautéing the vegetables before baking develops their sweetness and prevents the casserole from becoming watery.

Step 4: Make the Creamy Cheese Sauce

Reduce the heat to medium-low and return the beef to the skillet with the vegetables.

Add the softened cream cheese and beef broth. Stir gently as the cream cheese begins to melt and combine with the broth and cooking juices.

Continue stirring until the mixture becomes creamy and evenly coats the beef and vegetables. If the sauce seems too thick, add a small splash of beef broth. If it appears too thin, allow it to simmer gently for another minute or two.

Taste the mixture and adjust the seasoning as needed. You can add a little extra black pepper, paprika, or Worcestershire sauce if you prefer a stronger savory flavor.

Remove the skillet from the heat once everything is combined.

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