Keto Philly Cheesesteak Casserole

This Keto Philly Cheesesteak Casserole is a low-carb twist on the classic sandwich, combining tender beef, sautéed peppers, onions, and mushrooms with a rich, creamy sauce and melted cheese. It’s hearty, comforting, and packed with flavor, making it the perfect dish for keto enthusiasts or anyone craving a cheesy, meaty meal. Serve it as-is or pair it with a side salad for a complete, satisfying dinner.

📋 Ingredients

• 1 lb beef sirloin, ribeye, or flank steak , cut into thin strips or small cubes
• 1 medium onion , thinly sliced
• 1 bell pepper , thinly sliced (green, red, or both)
• 1 cup mushrooms , sliced (optional but recommended for added flavor)
• 3 cloves garlic , minced
• ½ cup heavy cream
• ½ cup beef broth (preferably low-sodium)
• 2 tbsp olive oil or butter
• 2 cups provolone cheese , shredded (or mozzarella, or a mix)
• Salt and pepper , to taste
• 1 tsp Worcestershire sauce (optional)
• 1 tsp Dijon mustard (optional, for extra flavor)
• Fresh parsley , chopped (for garnish)

👩‍🍳 Instructions

Step 1: Preheat the Oven

1. Preheat your oven to 375°F (190°C) . Lightly grease a 9×9-inch baking dish (or similar-sized casserole dish) with cooking spray or butter.

Step 2: Cook the Beef

1. In a large skillet, heat 1 tablespoon of olive oil or butter over medium-high heat .
2. Add the beef strips and cook for 4–5 minutes , stirring occasionally, until browned. Season with salt and pepper .
3. Once cooked, remove the beef from the skillet and set aside.

Step 3: Sauté the Vegetables

1. In the same skillet, add the remaining 1 tablespoon of olive oil or butter .
2. Add the sliced onion , bell pepper , and mushrooms (if using). Sauté for 5–7 minutes , stirring occasionally, until the vegetables are softened and slightly caramelized.
3. Stir in the minced garlic and cook for 1–2 minutes , until fragrant.

Step 4: Make the Sauce

1. Lower the heat to medium-low . Add the heavy cream and beef broth to the skillet with the vegetables. Stir well and let the mixture simmer for 3–4 minutes , allowing the sauce to thicken slightly.
2. If using, stir in the Worcestershire sauce and Dijon mustard . Taste and adjust seasoning with salt and pepper as needed.

Step 5: Combine Beef and Veggies

1. Return the cooked beef to the skillet with the vegetable mixture. Stir everything together until well combined.

Step 6: Assemble the Casserole

1. Transfer the beef and vegetable mixture to the prepared baking dish, spreading it out evenly.
2. Top with the shredded provolone cheese (or cheese of your choice), ensuring it covers the entire surface.

Step 7: Bake

1. Place the casserole in the preheated oven and bake for 15–20 minutes , or until the cheese is melted and bubbly.
2. For a golden-brown finish, broil the casserole for the last 2–3 minutes , keeping a close eye to prevent burning.

Step 8: Garnish and Serve

1. Remove the casserole from the oven and let it cool for 5 minutes .
2. Garnish with freshly chopped parsley and serve hot. Enjoy this cheesy, meaty masterpiece on its own or paired with a side of sautéed spinach or a fresh salad.

Optional Variations

• Add More Cheese: For an ultra-rich texture, stir in cream cheese or sprinkle cheddar cheese into the casserole before baking.
• Swap the Protein: Use chicken breast , turkey , or Italian sausage for a different flavor profile.
• Low-Carb Veggies: Reduce the carb count further by skipping the mushrooms and peppers or replacing them with zucchini slices or spinach .

Tips for Success

• Thinly Slice the Beef: Freeze the beef for 15–20 minutes before slicing to make it easier to cut into thin strips.
• Cheese Options: Provolone is traditional, but mozzarella, Monterey Jack, or a blend of cheeses works beautifully.
• Make Ahead: Assemble the casserole up to a day in advance, cover, and refrigerate. Bake as directed, adding a few extra minutes if needed.
• Storage: Store leftovers in an airtight container in the refrigerator for up to 3–4 days . Reheat in the microwave or oven.
• Freezing: Freeze the baked casserole (without garnish) for up to 3 months . Thaw overnight in the refrigerator and reheat before serving.

Why You’ll Love This Recipe

This Keto Philly Cheesesteak Casserole brings all the flavors of a classic cheesesteak into a low-carb, high-fat dish that’s perfect for keto diets. The combination of tender beef, caramelized veggies, and gooey melted cheese creates a comforting, indulgent meal that’s easy to prepare and deeply satisfying. Whether you’re feeding a crowd or meal prepping for the week, this casserole is sure to become a go-to favorite. Dive into this hearty, cheesy delight and savor every bite!