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Low Carb Philly Cheesesteak Casserole - Big Flavor, Fewer Carbs

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Prep Time 15 minutes
Cook Time 30 minutes
Total Time 45 minutes
Servings: 6 servings
Ingredients Method

Ingredients
  

  • 1.25–1.5 pounds thinly sliced steak (ribeye is classic; sirloin or flank work too)
  • 2 tablespoons olive oil (or avocado oil)
  • 1 large yellow onion, thinly sliced
  • 1 green bell pepper, thinly sliced
  • 1 red bell pepper, thinly sliced (optional for color and sweetness)
  • 8 ounces cremini or white mushrooms, sliced (optional but adds depth)
  • 2 cloves garlic, minced
  • 1 teaspoon kosher salt (plus more to taste)
  • 1/2 teaspoon black pepper
  • 1 teaspoon smoked paprika (optional, for a subtle smoky note)
  • 1 teaspoon Worcestershire sauce (check label for low-carb options)
  • 4 ounces cream cheese, softened
  • 1/2 cup heavy cream
  • 6–8 slices provolone (or 1.5 cups shredded provolone)
  • 1 cup shredded mozzarella (stretchy melt factor)
  • Fresh parsley (optional, for garnish)

Method
 

  1. Preheat the oven: Set to 375°F (190°C). Lightly grease a 9x13-inch baking dish.
  2. Sauté the veggies: Heat 1 tablespoon oil in a large skillet over medium-high. Add onions and peppers with a pinch of salt. Cook 5–7 minutes until softened and lightly browned. Add mushrooms and cook 3–4 minutes more. Stir in garlic for 30 seconds. Transfer to the baking dish.
  3. Cook the steak: In the same skillet, add the remaining oil. Increase heat to high. Season steak with salt, pepper, and smoked paprika. Sear in batches for 1–2 minutes per side until just cooked. Do not overcook. Add Worcestershire and toss. Layer steak over the veggies.
  4. Make the creamy binder: In a small bowl, whisk cream cheese and heavy cream until smooth. If stiff, microwave the cream cheese 10–15 seconds first. Season lightly with salt and pepper.
  5. Assemble the casserole: Drizzle the cream mixture evenly over steak and veggies. Sprinkle mozzarella on top. Lay provolone slices to cover the surface.
  6. Bake: Place in the oven for 12–15 minutes, until cheese is melted and bubbling at the edges.
  7. Optional broil: For browned, blistered cheese, broil 1–2 minutes. Watch closely.
  8. Rest and garnish: Let sit 5 minutes to set. Top with chopped parsley if you like. Serve hot.