Cheesy Philly beef and pepper casserole brings together tender browned beef, sautéed green peppers and onions, and a bubbling layer of melted cheese. It has all the savory flavor of a classic Philly-style sandwich filling, served hot from one baking dish without needing bread or a grill.
This easy beef casserole is perfect for busy dinners, meal prep, game-day food, and a low-fuss family meal. The vegetables stay slightly tender, the beef is deeply seasoned, and mozzarella with provolone gives the top a stretchy, golden finish.
The secret is cooking the vegetables separately from the beef just long enough to soften them. This keeps the casserole rich and flavorful instead of watery, while the final short bake melts the cheese without overcooking the meat.
Why You Will Love This Recipe
It is a one-pan-style dinner with simple everyday ingredients.
Beef, peppers, onions, and melted cheese create a hearty family-friendly meal.
It is ready in about 35 minutes.
Serve it alone, over rice, with toasted rolls, or in sandwich buns.
The filling reheats very well for lunch or dinner the next day.
Recipe Overview
Prep time: 10 minutes
Cook time: 25 minutes
Total time: 35 minutes
Yield: 6 servings
Difficulty: Easy
Best for: Weeknight dinners, meal prep, game day, and family meals
Ingredients
- 1½ pounds ground beef or thinly sliced steak
- 1 tablespoon olive oil
- 1 large green bell pepper, thinly sliced
- 1 medium yellow onion, thinly sliced
- 2 cloves garlic, minced
- 1 tablespoon Worcestershire sauce
- 1 teaspoon Italian seasoning
- ½ teaspoon garlic powder
- ½ teaspoon smoked paprika
- ½ teaspoon salt
- ½ teaspoon black pepper
- ¼ cup beef broth
- 1½ cups shredded mozzarella cheese
- 1 cup shredded provolone or Monterey Jack cheese
- 2 tablespoons grated parmesan, optional
Choosing the Best Beef
Ground beef makes this casserole quick, affordable, and easy to serve. Choose 80/20 ground beef for good flavor, then drain it after browning.
For a more traditional cheesesteak-style texture, use thinly sliced sirloin, ribeye, or shaved steak. Cook it quickly over high heat so it stays tender. Do not overcrowd the skillet, because crowded steak steams instead of browning.
How to Make Cheesy Philly Beef and Pepper Casserole
Step 1: Heat the oven
Preheat the oven to 400°F. Lightly grease a 9-by-13-inch baking dish.
Step 2: Cook the peppers and onions
Heat olive oil in a large skillet over medium-high heat. Add sliced green pepper and onion. Cook for 5 to 6 minutes until softened but still slightly crisp.
Add garlic and cook for 30 seconds. Transfer the vegetables to the baking dish.
Step 3: Brown the beef
In the same skillet, brown the ground beef until fully cooked, breaking it into small crumbles. Drain excess fat.
If using thin steak, cook it in batches for 2 to 3 minutes per batch, then return all of it to the skillet.
Step 4: Season the filling
Add Worcestershire sauce, Italian seasoning, garlic powder, smoked paprika, salt, pepper, and beef broth. Stir for 2 minutes until the beef is coated and the broth has reduced slightly.
The filling should be moist and flavorful but not swimming in liquid.
Step 5: Assemble the casserole
Add the seasoned beef to the baking dish with the peppers and onions. Toss gently to distribute the vegetables.
Step 6: Add cheese
Mix mozzarella and provolone, then sprinkle evenly over the top. Finish with parmesan if using.
Step 7: Bake until golden
Bake for 10 to 12 minutes, until the cheese is melted and bubbling. Broil for 1 to 2 minutes if you want deeper golden spots, watching closely.
Step 8: Rest and serve
Let the casserole rest for 5 minutes before scooping. Serve hot with toasted rolls, rice, mashed potatoes, or a crisp salad.
Tips for the Best Beef Casserole
Drain the beef after browning so the filling does not become greasy.
Cook the peppers and onions until tender-crisp. They will soften a little more in the oven.
Use freshly shredded cheese for the smoothest melt.
Keep the broth amount small. Too much liquid makes the casserole watery and prevents the cheese from browning well.
Do not overbake. The beef is already cooked before it enters the oven; baking is only for melting cheese and bringing the flavors together.
Easy Variations
Mushroom Philly Casserole
Add 8 ounces sliced mushrooms with the peppers and onions.
Spicy Beef and Pepper Bake
Use pepper jack cheese and add sliced jalapeños or crushed red pepper flakes.
Cheesesteak Sandwich Version
Spoon the hot filling into toasted hoagie rolls and serve immediately.
Low-Carb Version
Serve the casserole over cauliflower rice, in lettuce cups, or with roasted broccoli.
Creamy Version
Stir 4 ounces softened cream cheese into the beef before transferring it to the baking dish.
Make-Ahead and Storage
Make ahead: Cook the beef and vegetables up to 2 days ahead. Store covered in the refrigerator, then add cheese and bake fresh.
Fridge: Keep leftovers in an airtight container for up to 3 days.
Reheating: Reheat covered at 350°F for 12 to 15 minutes, or warm individual portions in the microwave until hot.
Freezer: Freeze the cooked beef and pepper filling without cheese for up to 2 months. Thaw overnight, add cheese, and bake.
Frequently Asked Questions
Can I use ground turkey instead of beef?
Yes. Ground turkey works well; add an extra teaspoon of olive oil or Worcestershire sauce for more richness.
What cheese is best for Philly-style beef?
Provolone is the classic choice. Mozzarella adds stretch, while Monterey Jack melts smoothly. Use a combination for the best result.
Why is my casserole watery?
The vegetables may have released too much liquid, or too much broth was added. Cook the beef mixture until most broth has reduced before baking.
Can I add potatoes?
Yes. Serve the filling over roasted potatoes, fries, or baked potato halves rather than mixing raw potatoes into the casserole.
Nutrition Information
Estimated per serving:
- Calories: 410
- Protein: 32g
- Fat: 29g
- Carbohydrates: 7g
- Fiber: 2g
- Sodium: 610mg
Nutrition information is estimated and will vary depending on ingredients used.
Final Thoughts
Cheesy Philly beef and pepper casserole is a fast, comforting dinner that gives you savory beef, tender vegetables, and bubbling melted cheese in every scoop. Brown the beef well, keep the filling from becoming too wet, and bake only until the cheese is golden for the best result.