Philly Cheesesteak Casserole.

Prep Time: 15 minutes
Cook Time: 30 minutes
Total Time: 45 minutes
Yield: 6 Servings
Difficulty Intensity: Easy / Moderate
Flavor Profile: Savory, rich beef flavor, garlic-infused, mild sweetness from sautéed peppers, and creamy, gooey cheese.

Equipment Needed

Large Skillet (12-inch): Cast iron or stainless steel works best for achieving a great sear on the meat and vegetables.
9×13-inch Glass Baking Dish: For building and baking the casserole evenly.
Slotted Spoon: Helps transfer the beef and vegetable mixture while draining excess moisture.
Measuring Cups and Spoons: For precise seasoning and ingredient ratios.

Key Ingredients & Substitutions

Ground Beef or Ribeye Steak (1.5 lbs / 680g): Lean ground beef (85/15) works fantastically for a quick casserole, but thinly sliced ribeye or sirloin creates an even more traditional texture.
Bell Peppers (2 large / approx. 300g): A mix of green and red (or yellow) bell peppers provides colorful contrast and natural sweetness.
Cremini or White Button Mushrooms (8 oz / 225g): Freshly sliced to add depth and earthy savoriness.
Yellow Onion (1 medium / approx. 150g): Sliced thin to caramelize and blend smoothly into the mixture.
Cream Cheese (4 oz / 115g, softened): Binds the meat and vegetables together while adding a velvety texture.
Provolone Cheese (6–8 slices): The quintessential cheesesteak topping. Sub with Mozzarella or White American cheese if desired.
Provolone or Mozzarella (Shredded, 1 cup): Mixed into the filling for cheese distribution throughout every bite.
Garlic Powder (1 tsp) & Onion Powder (½ tsp): Enhances the savory profile.
Worcestershire Sauce (1 tbsp / 15ml): Adds a rich umami punch to the beef.
Olive Oil or Butter (1 tbsp / 15ml): For sautéing the vegetables.
Salt & Black Pepper: Seasoned to taste.

Step-by-Step Instructions

Step 1: Prep & Preheat

Preheat your oven to 375°F (190°C). Lightly grease a standard 9×13-inch glass casserole dish with non-stick cooking spray or a light coating of olive oil.

Step 2: Sear the Beef

Place a large skillet over medium-high heat (Intensity: Level 7 out of 10). Add the ground beef (or thinly sliced steak). Season with garlic powder, onion powder, salt, black pepper, and Worcestershire sauce. Cook for 6 to 8 minutes, breaking the meat up with a wooden spoon until fully browned and cooked through. Drain any excess grease from the skillet, then transfer the meat into your prepared baking dish.

Step 3: Sauté the Vegetable Medley

Return the skillet to the stove over medium heat (Intensity: Level 5 out of 10). Heat 1 tablespoon of olive oil or butter. Add the sliced onions, bell peppers, and cremini mushrooms. Sauté for 7 to 9 minutes, stirring periodically until the vegetables are tender, glossy, and slightly browned on the edges.

Chef’s Note: Cooking off the moisture in the mushrooms and peppers during this step prevents the casserole from becoming watery during baking.

Step 4: Mix with Cream Cheese

Reduce the skillet heat to low (Intensity: Level 2 out of 10). Add the softened cream cheese directly to the warm vegetables, stirring until melted and thoroughly coating the peppers and mushrooms.

Step 5: Assemble the Layered Casserole

Pour the creamy vegetable mix over the beef layer in the baking dish.
Sprinkle 1 cup of shredded provolone or mozzarella cheese across the top, tossing slightly with a fork to combine the meat, vegetables, and cheese evenly.
Top the entire casserole with 6 to 8 whole slices of provolone cheese, completely covering the surface to form a molten crust.

Step 6: Bake to Bubbly Perfection

Place the casserole dish uncovered on the center rack of your preheated oven. Bake at 375°F (190°C) (Intensity: Medium-High Bake) for 15 to 20 minutes, or until the cheese on top is fully melted, bubbling at the edges, and lightly golden-brown.

Step 7: Rest and Serve

Remove from the oven and allow the casserole to rest at room temperature for 5 minutes before slicing. This allows the cheeses to set slightly, making serving much easier. Garnish with fresh herbs if desired, and enjoy!

Storage & Reheating Instructions

Refrigeration: Cover the baking dish tightly with foil or transfer leftovers to an airtight glass container. Keep refrigerated for up to 4 days.
Reheating: Reheat individual portions in the microwave on high for 60–90 seconds, or place the baking dish back in a 350°F (175°C) oven for 10–12 minutes until warmed through and the cheese is bubbly again.

Nutritional Information

The following nutrition breakdown is estimated per serving (1 serving out of 6 total).

Nutrient	Amount Per Serving	% Daily Value*
Calories	390 kcal	—
Total Fat	27 g	35%
Saturated Fat	13 g	65%
Trans Fat	0.5 g	—
Cholesterol	105 mg	35%
Sodium	580 mg	25%
Total Carbohydrate	6 g	2%
Dietary Fiber	1.5 g	5%
Total Sugars	3 g	—
Includes Added Sugars	0 g	0%
Protein	31 g	62%
Vitamin D	0.2 mcg	1%
Calcium	280 mg	22%
Iron	2.6 mg	14%
Potassium	480 mg	10%