High Protein Low-Carb Philly Cheesesteak Casserole 

Description

High Protein Low-Carb Philly Cheesesteak Casserole is a delicious, comforting, and healthier twist on the classic Philly cheesesteak sandwich. This easy casserole combines tender strips of seasoned beef, sautéed onions, colorful bell peppers, mushrooms, and a creamy cheesy topping baked together into a satisfying low-carb meal. It delivers all the iconic flavors of a traditional cheesesteak while skipping the bread and focusing on protein-rich ingredients. The combination of juicy beef, melted cheese, and savory vegetables creates a hearty dish that is perfect for family dinners, meal prep, or anyone following a high-protein or low-carb lifestyle. This recipe is packed with flavor from garlic, herbs, and classic cheesesteak seasonings while keeping the ingredients simple and easy to prepare. Unlike traditional sandwiches, this casserole is convenient because everything cooks together in one dish, making cleanup easier and serving effortless. It is a perfect option for busy weeknights when you want a filling meal that supports your nutrition goals without sacrificing taste. Serve it with a fresh salad, roasted vegetables, or cauliflower rice for a complete low-carb dinner. Whether you are a fan of classic Philly flavors or simply looking for a protein-packed comfort meal, this High Protein Low-Carb Philly Cheesesteak Casserole is sure to become a family favorite.

Ingredients For the Beef Mixture

• 2 pounds lean ground beef or thinly sliced sirloin steak
• 1 tablespoon olive oil
• 1 medium onion, sliced
• 2 bell peppers, sliced (green and red)
• 1 cup mushrooms, sliced
• 3 cloves garlic, minced
• 1 teaspoon salt
• 1 teaspoon black pepper
• 1 teaspoon paprika
• 1 teaspoon Italian seasoning
• 1 teaspoon Worcestershire sauce

For the Creamy Cheese Layer

• 8 ounces cream cheese, softened
• ½ cup sour cream or Greek yogurt
• 1 cup shredded mozzarella cheese
• 1 cup shredded provolone cheese
• ½ cup grated Parmesan cheese
• ½ teaspoon garlic powder
• ½ teaspoon onion powder
• ¼ teaspoon black pepper

For Topping

• Extra shredded cheese
• Fresh parsley, chopped
• Cracked black pepper

Optional Additions

• Spinach
• Jalapeños
• Cauliflower rice
• Turkey instead of beef
• Steak strips instead of ground beef

Step-by-Step Instructions

1. Preheat the oven to 375°F (190°C). Lightly grease a baking dish with cooking spray or olive oil.
2. Heat olive oil in a large skillet over medium-high heat.
3. Add sliced onions, bell peppers, and mushrooms. Cook for 5–7 minutes until softened and slightly caramelized.
4. Add garlic and cook for 30 seconds until fragrant.
5. Add ground beef or sliced steak to the skillet and cook until browned and fully cooked.
6. Drain excess grease if needed.
7. Season the beef mixture with salt, pepper, paprika, Italian seasoning, Worcestershire sauce, and garlic powder.
8. In a separate bowl, mix softened cream cheese, sour cream or Greek yogurt, mozzarella, provolone, Parmesan, onion powder, and black pepper until smooth.
9. Combine the beef and vegetable mixture with the creamy cheese mixture.
10. Transfer everything into the prepared baking dish and spread evenly.
11. Sprinkle extra cheese on top.
12. Bake uncovered for 20–25 minutes until the cheese is melted, golden, and bubbling.
13. Remove from the oven and let it rest for 5 minutes before serving.
14. Garnish with fresh parsley and cracked black pepper.
15. Serve warm with your favorite low-carb side dish.

Tips, Notes & Q/A

• Use thinly sliced steak for a more traditional Philly cheesesteak texture.
• Ground beef makes this recipe quicker, easier, and budget-friendly.
• Do not overcook the vegetables; keeping some texture makes the casserole more enjoyable.
• For extra protein, use lean beef and add Greek yogurt instead of sour cream.
• Provolone cheese gives the most authentic cheesesteak flavor, but mozzarella works well too.
• Add cauliflower rice underneath the casserole for a complete low-carb bowl meal.
• Let the casserole rest before serving so the cheese sauce sets slightly.
• Store leftovers in an airtight container in the refrigerator for up to 4 days.
• Reheat gently in the oven or microwave until warm.
• Freeze individual portions for easy meal prep for up to 3 months.

Can I use chicken instead of beef?
Yes, chicken works well and creates a lighter high-protein version.

Is this recipe keto-friendly?
Yes, this casserole is naturally low in carbohydrates and works well for a keto-style meal plan.

Can I prepare this ahead of time?
Yes, assemble the casserole, refrigerate, and bake when ready.

What vegetables can I add?
Spinach, zucchini, cauliflower, or extra mushrooms are great low-carb additions.

How can I make it higher in protein?
Increase the meat portion or add extra Greek yogurt-based cheese sauce.

Servings & Nutrition

This recipe makes approximately 6 servings. Each serving contains an estimated 450–550 calories, 40–45g protein, 8–12g carbohydrates, 30–35g fat, and 2–4g fiber, depending on ingredients used. The beef provides high-quality protein and essential nutrients, while cheese adds calcium and rich flavor. Bell peppers, onions, and mushrooms contribute vitamins, minerals, and antioxidants. High Protein Low-Carb Philly Cheesesteak Casserole is a satisfying, nutritious, and flavorful meal perfect for healthy eating, meal prep, and anyone craving classic comfort food with a low-carb twist.