Steak and Mushroom Foil Packs

Steak and Mushroom Foil Packs are loaded with marinated sirloin steak and tender mushrooms. This is the perfect camping or cookout food! It requires minimal ingredients and cooks in under 20 minutes!

4.35 from 20 votes

Prep Time10 mins

Cook Time20 mins

Total Time30 mins

CourseBeef

CuisineAmerican

Servings 4 foil packs

Calories450 kcal

Equipment

  • Pyrex Glass Mixing Bowl Set (3-Piece)
  • Aluminum foil

Ingredients 

  • 2 lbs top sirloin steak cut into 2-inch pieces
  • ½ cup avocado oil
  • ⅓ cup low-sodium soy sauce
  • ¼ cup Worcestershire sauce
  • 8 garlic cloves minced
  • 16 oz mushrooms (halved if large)
  • 2 tsp steak seasoning
  • Fresh thyme optional for garnish

Instructions 

  • In a large bowl, combine the steak pieces, oil, soy sauce, Worcestershire sauce, and minced garlic. Cover and marinate for at least 8 hours. 
  • Heat the grill to medium-high heat, approximately 400 degrees F. Lay out 4 large pieces of aluminum foil on your counter or work surface. 
  • Uncover the marinaded steak and add the mushrooms, tossing to coat in the liquid. 
  • Divide the mixture evenly between the 4 pieces of aluminum foil, reserving the liquid at the bottom of the bowl. 
  • Add 1 tbsp of the reserved marinade to each foil packet, and sprinkle each foil packet with ½ tsp steak seasoning. 
  • Fold the foil packets by bringing 2 sides together and folding them over, then closing the ends.
  • Grill the packets for 15-20 minutes, until the steak is cooked per your preference. For my grill, it took 18 minutes for the steak to reach medium-rare consistency. Remove the packets from the grill, and allow them to rest for at least 5 minutes. 
  • Open the packets, garnish with fresh thyme, and serve!

Notes

Steak seasoning is found at all grocery stores, there are many brands, and any variety will work.

This recipe makes 4 individual foil packs, and each one has 5.8 net carbs.

Nutrition

Serving: 1 Foil Packet Calories: 450kcalCarbohydrates: 7gProtein: 50gFat: 22gCholesterol: 134mgSodium: 418mgFiber: 1.2gSugar: 3.4g

Steak and Mushroom Foil Packs Recipe: Perfect for Grilling or Camping

Overview

If you’re looking for an easy and flavorful way to cook steak while enjoying the great outdoors or hosting a backyard cookout, then these Steak and Mushroom Foil Packs are exactly what you need. This recipe is not only delicious but also incredibly simple to make. With minimal prep time, just a few ingredients, and the convenience of cooking in foil, this dish delivers tender, juicy steak and earthy mushrooms—perfectly cooked and infused with a mouthwatering marinade.

Ideal for grilling, camping trips, or a simple family dinner at home, this recipe ensures you spend less time cleaning up and more time enjoying your meal. The combination of sirloin steak, garlic, and fresh mushrooms creates a savory base, while the marinade (which includes avocado oil, soy sauce, and Worcestershire sauce) enhances the flavor, making each bite an explosion of deliciousness. Whether you’re an experienced griller or a first-timer, this dish is as easy as it is flavorful, and it requires only about 30 minutes from start to finish.

Let’s dive into the full recipe, including step-by-step instructions, cooking tips, and all the nutritional details you’ll need to make this a success on your grill.

Ingredients

For the Foil Packs

  • 2 lbs top sirloin steak (cut into 2-inch pieces)
  • ½ cup avocado oil (or another high-heat oil like olive oil or grapeseed oil)
  • ⅓ cup soy sauce (low-sodium is preferred for a lighter option)
  • ¼ cup Worcestershire sauce
  • 8 garlic cloves (minced)
  • 16 oz mushrooms (halved if large, or quartered for smaller mushrooms)
  • 2 tsp steak seasoning (any variety you prefer, or homemade seasoning)
  • Fresh thyme (optional, for garnish)

Equipment Needed

  • Grill (medium-high heat)
  • 4 large sheets of aluminum foil (enough to wrap the steaks and mushrooms into individual packets)
  • Large mixing bowl
  • Tongs or a spatula (for handling the foil packets)
  • Meat thermometer (optional, for checking steak doneness)

Instructions

Step 1: Marinate the Steak

  1. Prepare the Steak
    Start by cutting your top sirloin steak into 2-inch pieces. You want the pieces to be large enough to stay juicy while cooking in the foil, but small enough to cook evenly. The steak cuts should be similar in size so that they cook at the same rate.
  2. Create the Marinade
    In a large mixing bowl, combine the steak pieces with the avocado oil, soy sauce, Worcestershire sauce, and minced garlic. These ingredients create a savory, slightly tangy marinade that infuses the steak with deep flavors while keeping it moist during cooking. The oil helps tenderize the meat, while the soy sauce and Worcestershire sauce add that signature umami flavor that makes steak irresistible.
  3. Marinate for Flavor
    Cover the bowl with plastic wrap or a lid and let the steak marinate in the refrigerator for at least 8 hours. If you’re short on time, a minimum of 30 minutes will still allow the flavors to infuse, but for the best taste, letting it marinate overnight is ideal. The longer the steak marinates, the more flavorful and tender it will be.

Step 2: Prepare the Grill

  1. Heat the Grill
    While the steak is marinating, preheat your grill to medium-high heat, approximately 400°F (200°C). The high heat ensures that the foil packs cook quickly, sealing in the flavors without losing moisture.
  2. Prep the Grill Grates
    To prevent sticking, lightly oil the grill grates with a paper towel dipped in vegetable oil or spray them with non-stick cooking spray before placing the foil packs on the grill.

Step 3: Assemble the Foil Packs

  1. Prepare the Foil Sheets
    Lay out four large sheets of aluminum foil on your work surface. Each sheet should be large enough to contain a portion of the steak, mushrooms, and marinade, as well as to allow for folding the foil into a secure packet. Each packet will serve as an individual portion.
  2. Add Steak and Mushrooms to Foil
    Uncover the marinated steak and gently toss the steak pieces with the mushrooms in the marinade. The mushrooms will absorb some of the marinade, which will help them cook tender and flavorful, while also adding a delicious earthy depth to the dish.
  3. Divide the Mixture
    Evenly divide the steak and mushroom mixture between the four foil sheets. Be sure to include some of the marinade in each packet, as this will help keep the steak moist and juicy as it cooks.

Step 4: Season and Seal the Foil Packs

  1. Season Each Packet
    Sprinkle ½ teaspoon of steak seasoning over each packet. You can use your favorite brand of steak seasoning or make your own. A simple blend of salt, black pepper, garlic powder, and onion powder works great if you don’t have pre-made seasoning on hand.
  2. Fold the Foil
    Carefully fold the edges of the foil together, bringing the two long sides towards the middle and folding them down to create a seal. Then fold the shorter sides to close off the ends, making sure the packet is completely sealed to trap the steam inside.

Step 5: Grill the Foil Packs

  1. Grill the Foil Packs
    Place the sealed foil packs directly on the grill. Grill the packets for 15-20 minutes, depending on the size of your steak pieces and how done you prefer your meat. For medium-rare steak, 18 minutes should be sufficient. The exact cooking time will vary depending on your grill and the thickness of the steak pieces.
  2. Check for Doneness
    If you prefer a more accurate way to check doneness, use a meat thermometer to measure the internal temperature of the steak. For medium-rare, the internal temperature should reach 130°F, while medium will be around 140°F, and well-done will be 160°F.

Step 6: Let It Rest & Serve

  1. Rest the Foil Packs
    After removing the foil packs from the grill, let them rest for at least 5 minutes before opening. This allows the juices to redistribute throughout the meat, ensuring that each bite is tender and flavorful.
  2. Open the Foil Packs
    Carefully open the foil packs, being cautious of the hot steam that may escape. Use tongs or a spatula to serve the steak and mushrooms.
  3. Garnish & Serve
    Garnish with fresh thyme if desired, and serve immediately. The thyme adds a pop of color and a fragrant, herby finish to the dish.

Nutrition Information (per serving):

  • Calories: 450 kcal
  • Protein: 50g
  • Fat: 22g
  • Saturated Fat: 8g
  • Cholesterol: 134mg
  • Sodium: 418mg
  • Carbohydrates: 7g
  • Fiber: 1.2g
  • Net Carbs: 5.8g
  • Sugar: 3.4g

Tips for Success

  1. Choose the Right Cut of Steak
    While top sirloin is a great choice for this recipe, you can also use other cuts of beef, such as ribeye or flank steak. Just be mindful that fattier cuts (like ribeye) may require slightly more cooking time.
  2. Customize the Marinade
    Feel free to adjust the marinade to suit your taste. For a slightly spicier kick, add a splash of hot sauce or chili flakes. If you prefer a sweeter flavor, a drizzle of honey or brown sugar can balance out the savory components of the soy sauce and Worcestershire sauce.
  3. Grill at the Right Temperature
    It’s important to ensure your grill is at the correct temperature. Medium-high heat (around 400°F) is optimal for grilling foil packets. If your grill runs hot, check the packets earlier to avoid overcooking the steak. You can always open one packet to check for doneness.
  4. Cooking on a Campfire
    If you’re camping, you can use the same technique by cooking the foil packs over a campfire or in a portable camping stove. Make sure the fire is at a consistent medium-high heat and that you check the packets frequently to avoid burning.
  5. Vegetable Add-Ins
    This recipe is versatile! You can add other vegetables to the foil packs for extra nutrition and flavor. Try adding bell peppers, zucchini, or onions along with the mushrooms to round out the dish.
  6. Serving Suggestions
    These foil packs are a complete meal on their own, but you can serve them alongside a side salad or a cauliflower rice dish for extra volume without adding many carbs. A dollop of sour cream or a sprinkle of grated cheese can also complement the flavors beautifully.
  7. Make Ahead
    The steak can be marinated a day ahead, saving you time when you’re ready to cook. You can also pre-assemble the foil packs and