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Philly Cheese Steak Foil Packet Dinners

Philly cheesesteak foil packet dinners with thinly sliced sirloin, peppers, onions, and mushrooms sealed in heavy-duty foil until melty provolone steams hot. All-in-one grilled dinner for easy cleanup—open the packet to serve straight in rolls or as-is.
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Prep Time 20 minutes
Cook Time 20 minutes
Total Time 40 minutes
Servings: 4 servings
Course: Main Dish
Cuisine: American
Calories: 650
Ingredients Equipment Method Notes

Ingredients
  

Sirloin and vegetables
  • 1.5 lb sirloin steak thinly sliced
  • 2 count bell peppers sliced
  • 1 count onion sliced
  • 2 cup mushrooms sliced
Cheese and seasoning
  • 8 slice provolone cheese
  • 2 tbsp Worcestershire sauce
  • 2 tbsp olive oil
  • 1 tsp garlic powder
  • 0.25 salt and pepper to taste season to taste
Foil
  • 4 large sheets heavy-duty foil
Serving (optional)
  • 4 hoagie rolls for serving (optional)

Equipment

  • 1 sheet pan

Method
 

Assemble the foil packets
  1. Divide the thinly sliced sirloin steak, bell peppers, onion, and sliced mushrooms among 4 heavy-duty foil sheets in even piles. Leave space at the top so you can seal the packets.
  2. Drizzle each packet with the olive oil and Worcestershire sauce. Move the meat and vegetables around lightly so the liquid coats the surfaces.
  3. Sprinkle each packet with garlic powder, salt, and pepper to taste. Keep the seasoning evenly distributed over the steak and vegetables.
  4. Top each packet with 2 slices of provolone cheese. Place the cheese on top so it melts onto the steak and vegetables.
  5. Fold the foil into sealed packets, crimping the edges tightly to prevent steam from escaping. Make sure there are no gaps along the seams.
Grill and serve
  1. Grill the packets over medium heat for 18-20 minutes, turning them halfway. Watch for hot steam building inside the foil as a visual cue they’re cooking through.
  2. Carefully open the packets and serve immediately. Let the melted cheese steam over the steak and vegetables, then place into hoagie rolls or serve as-is.

Notes

Pro tip: slice vegetables thin and keep the packets well-sealed so everything cooks at the same pace and the cheese fully melts. Store leftovers in an airtight container in the refrigerator up to 3 days; reheat in the microwave until steaming hot. Freezing is not recommended due to texture changes in steak and mushrooms. Dietary swap: use dairy-free provolone-style slices for a lactose-free option.