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Philly Cheese Steak Foil Packet Dinners

Philly cheesesteak foil packet dinners with thin-sliced sirloin, peppers, onions, and mushrooms wrapped and grilled until tender. Each packet steams open to melted provolone over savory steak and vegetables with easy cleanup.
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Prep Time 20 minutes
Cook Time 20 minutes
Total Time 40 minutes
Servings: 4 servings
Course: Dinner
Cuisine: American
Calories: 850
Ingredients Equipment Method Notes

Ingredients
  

Sirloin steak, sliced
  • 1.5 lb sirloin steak
Bell peppers, sliced
  • 2 bell peppers
Onion, sliced
  • 1 onion
Mushrooms, sliced
  • 2 cup mushrooms
Provolone cheese slices
  • 8 provolone cheese
Worcestershire sauce
  • 2 tbsp Worcestershire sauce
Olive oil
  • 2 tbsp olive oil
Garlic powder
  • 1 tsp garlic powder
Salt and pepper
  • 0.25 tsp salt to taste
  • 0.125 tsp pepper to taste
Heavy-duty foil sheets
  • 4 heavy-duty foil
Hoagie rolls (optional)
  • 4 hoagie rolls optional for serving

Equipment

  • 1 sheet pan

Method
 

Assemble the foil packets
  1. Divide the sirloin steak, bell peppers, onion, and mushrooms evenly among 4 heavy-duty foil sheets, keeping layers fairly even for uniform cooking. Visual cue: the filling should fill each foil sheet to about the same height.
  2. Drizzle olive oil and Worcestershire sauce over the steak and vegetables on each foil sheet. Visual cue: you should see a light sheen across the filling in each packet.
  3. Sprinkle garlic powder, salt, and pepper over each packet. Visual cue: seasoning should be distributed across the top layer so no spot looks bare.
  4. Top each packet with 2 slices provolone cheese, placing the cheese directly over the center of the filling. Visual cue: cheese should sit as a single layer that will melt downward.
  5. Fold foil into sealed packets by bringing edges together and crimping tightly. Visual cue: seams should be closed with no gaps so steam stays inside.
Grill and serve
  1. Grill the packets over medium heat for 18-20 minutes, flipping halfway through. Visual cue: look for visible steam when you carefully check one packet through the foil.
  2. Carefully open the packets and serve right away, in hoagie rolls or as-is. Visual cue: melted provolone should be pooled over the steak and vegetables and steaming hot.

Notes

For the best melt and tenderness, slice the steak thin and keep the foil packets tightly sealed so steam cooks everything evenly. Refrigerate leftovers in an airtight container for up to 3 days; reheat in a skillet over medium-low until hot (or microwave until steaming). Freezing isn’t recommended because the cheese and vegetables may turn watery after thawing. Dietary swap: use reduced-fat provolone or part-skim cheese for a lighter take without changing the method.