This Philly Cheese Steak Casserole recipe puts a fun spin on the traditional sandwich that can be made in less than 1 hour. Sirloin steak, bell peppers, onions, mushrooms, and provolone cheese slices come together for a filling and easy dinner idea perfect for weeknights.
You will love this casserole recipe if you enjoy recipes like Stuffed Bell Pepper Casserole, Jalapeño Popper Chicken Casserole, and Cheesy Beef Casserole with Cauliflower Rice and Spinach.
This easy casserole recipe is foolproof.
It’s so easy to make and yields a delicious and filling meal for busy weeknights.
Plus, it stores really well in the refrigerator or the freezer.
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💛 Why you’ll love this recipe
- Ready in under 1 hour.
- Straightforward ingredients that you may already have on hand.
- Freezes and reheats well for eating later.
- Low-carb, keto-friendly, and gluten-free.
➡️ Ingredients
- Sirloin steak
- Unsalted butter
- Minced garlic
- Green bell pepper
- White mushrooms
- Yellow onion
- Egg
- Shredded mozzarella cheese
- Cream cheese
- Pepper
- Salt
- Provolone cheese slices
⏲ How to make this Philly cheese steak casserole
This is an overview of the recipe’s instructions. The full instructions can be found in the recipe card at the bottom of this post.
- Slice Steak: Cutting against the grain, slice the steak into thin strips then cut those slices into ½” pieces.
- Preheat Oven: Preheat the oven to 400 degrees and spray a 9×13-inch baking dish with nonstick cooking spray.
- Cook Steak: In a large skillet over medium heat, melt butter. Add minced garlic and heat until fragrant, about 1 minute. Add sliced steak and cook until browned. Transfer the cooked steak to a plate or bowl and set aside. Discard any liquid from the pan.
- Cook Vegetables: To the same skillet over medium-high heat, add peppers, mushrooms, and onions and cook until vegetables are tender and liquid has evaporated, which should take about 5-7 minutes. Remove the skillet from the heat and set aside.
- Mix Ingredients Together: To a mixing bowl, add egg, shredded mozzarella, cream cheese, pepper, and salt, and, using an electric mixer, mix until well combined. Stir in the cooked steak and vegetables.
- Prepare Casserole in Baking Dish and Bake: Transfer the mixture to the prepared baking dish and arrange the provolone cheese slices in an even layer on top of the mixture. Transfer the baking dish to the middle oven rack to bake until the edges of the casserole are golden brown and bubbling, which will take about 25 minutes.
- Serve: Remove the baking dish from the oven and allow the casserole to cool for at least 10 minutes before slicing and serving.
👉 Ingredient substitution suggestions
- Sirloin Steak: Ribeye steak, flank steak, strip steak, skirt steak, or even ground beef can be used.
- Unsalted Butter: You can swap salted butter at a 1:1 ratio for unsalted butter. If using salted butter, omit the added salt in the recipe.
- Minced Garlic: Use ½ teaspoon garlic powder.
- Green Bell Peppers: Red, yellow, or orange bell peppers can also be used.
- Provolone Cheese: American, cheddar, or pepper jack slices will work.
✨ Variations
- Pour in a little Worcestershire sauce for some added flavor. Mix this in with the cream cheese mixture.
- Add some slices of cheddar cheese to make the casserole even cheesier.
〰️ How to serve
- Veggies – Serve with jicama fries or mashed cauliflower.
- Salad – Serve alongside bacon coleslaw or Caesar salad.
- Potatoes – Serve with roasted potatoes, baked fries, air fryer smashed potatoes, or mashed potatoes.
💬 FAQs
How do I store leftover Philly cheesesteak casserole?
Allow the casserole to cool down to room temperature before storing leftovers in an airtight container in the refrigerator for up to 4 days. Reheat individual servings in the microwave in 30-second increments until warmed throughout.
Can this casserole be frozen?
Allow the casserole to cool down to room temperature before storing the prepared casserole in an airtight container in the freezer for up to 3 months. Allow the dish to defrost in the fridge overnight before reheating in the oven at 400 degrees until warmed throughout.
📚 More casserole recipes
🍽 Recipe
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Philly Cheese Steak Casserole
Ingredients
- 1 ½ pounds sirloin steak
- 1 Tablespoon unsalted butter
- 2 teaspoons minced garlic
- ¾ cup chopped green bell peppers
- 2 cups roughly chopped white mushrooms
- ½ cup thinly chopped yellow onion
- 1 egg
- 1 cup shredded mozzarella cheese
- 6 ounces cream cheese, softened
- ½ teaspoon pepper
- ¼ teaspoon salt
- 6 slices provolone cheese
Instructions
- Slice Steak: Cutting against the grain, slice steak into thin strips then cut slices into ½” pieces.
- Preheat Oven: Preheat oven to 400 degrees and spray 9×13-inch baking dish with nonstick cooking spray.
- Cook Steak: In a large skillet over medium heat, melt butter. Add minced garlic and heat until fragrant, about 1 minute. Add sliced steak and cook until browned. Transfer cooked steak to plate or bowl and set aside. Discard liquid from pan.
- Cook Vegetables: To same skillet over medium-high heat, add peppers, mushrooms, and onions and cook until vegetables are tender and liquid has evaporated, about 5-7 minutes. Remove skillet from heat. Set aside.
- Mix Ingredients Together: To a mixing bowl, add egg, shredded mozzarella, cream cheese, pepper, and salt and, using an electric mixer, mix until well combined. Stir in cooked steak and vegetables.
- Prepare Casserole in Baking Dish and Bake: Transfer mixture into prepared baking dish and arrange provolone cheese slices in an even layer atop mixture. Transfer dish to middle oven rack to bake until edges of casserole are golden brown and bubbling, about 25 minutes.
- Serve: Remove baking dish from oven and allow casserole to cool for at least 10 minutes before slicing and serving.
Video
Recipe Notes
Nutrition
Photo credit: Jess Larson
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