Garlic Butter Steak Foil Packets with Potatoes and Asparagus Step-by-step instructions

Before you start

Before you begin cooking, gather all of your ingredients and prepare your workspace. Wash and dry the baby potatoes, then cut them into small, even halves. Trim the tough, woody ends off the fresh asparagus and chop the spears into bite-sized pieces.

Cut the steak into uniform one-inch cubes and pat them dry with a paper towel. Melt the butter and mince the garlic cloves. Having all these components prepped and organized beforehand makes assembling the foil packets quick and effortless.

Instructions

Potato Par-Baking and Prep

1. 1Season and Par-Bake Potatoes
   Preheat the oven to 400°F (200°C). Tear off four 12-inch sheets of heavy-duty aluminum foil. Toss the halved baby potatoes in a large bowl with the oil until well coated. Place the prepared potatoes in the center of the foil sheets, seal loosely, and bake for 10 minutes to give them a head start.
   Look for The potatoes should be slightly softened but not fully cooked.
   Tip Par-baking ensures the potatoes finish cooking at the same time as the steak.

At the end of this phase, the baby potatoes should be partially cooked, showing a slightly softened exterior and a light coating of oil. The oven should be fully preheated, and the fragrant aroma of roasting potatoes should begin to fill the kitchen, indicating they are ready for the main ingredients.

Packet Assembly and Butter Drizzle

2. 2Mix Garlic Herb Butter
   In a small bowl, whisk together the melted butter, minced garlic, and chopped fresh herbs. Set aside a third of this garlic butter mixture to use as a final glaze after cooking.
   Look for The butter mixture should be fragrant and well combined.
   Tip Fresh herbs like parsley, rosemary, and thyme provide the best flavor profile.
3. 3Assemble the Packets
   Carefully open the hot foil packets. Divide the steak medallions and trimmed asparagus pieces evenly among the packets, arranging them alongside the potatoes. Drizzle the garlic herb butter over everything.
   Look for The ingredients should be arranged in a single layer for even cooking.
   Tip Keep raw steak cold in the refrigerator until the exact moment of assembly.

At this point, the foil packets are filled with the steak medallions, asparagus, and potatoes, all arranged neatly. The rich, melted garlic herb butter should be drizzled evenly over the ingredients, filling the packets with a savory, garlicky aroma before they are sealed tightly for the final bake.

Final Bake and Rest

4. 4Bake the Packets
   Fold the edges of the foil securely to seal the packets completely, leaving a little room inside for steam to circulate. Place the packets on a baking sheet and bake at 400°F (200°C) for 12 to 15 minutes.
   Look for The foil packets should puff up slightly as steam builds inside.
   Tip Make sure the seals are tight so no juices leak onto the baking sheet.
5. 5Check Doneness and Rest
   Carefully open the packets, avoiding the hot steam. Check that the steak has reached a safe internal temperature of 145°F (63°C). Let the steak rest inside the open packets for 3 minutes to keep the meat juicy. Pour the reserved garlic herb butter over the sizzling steak slices and vegetables before serving.
   Look for The steak should be browned and the potatoes fork-tender.
   Safe temperature 145°F (63°C) internal temperature (steaks, chops and roasts)
   Tip Letting the meat rest is crucial for retaining its savory juices.

When you carefully open the finished packets, steam should billow out, carrying a rich aroma of seared steak and garlic. The steak should be juicy and browned, the potatoes golden and fork-tender, and the asparagus vibrant green. The butter at the bottom of the packet should be bubbling actively.

Common mistakes

A common mistake is sealing the foil packets too tightly without leaving any headspace, which prevents the steam from circulating and results in unevenly cooked ingredients.

Another error is cutting the steak cubes too small or the potatoes too large; this causes the steak to overcook before the potatoes become tender.

Finally, avoid using thin, standard aluminum foil, as it can easily rip when you fold it or flip the packets, letting the delicious garlic butter leak out onto your baking sheet.

How to tell it’s done

To ensure the steak is cooked safely and perfectly, use a digital meat thermometer inserted into the center of the largest steak cube. The steak is done when it reaches an internal temperature of 145°F (63°C) for a safe, medium-rare to medium result.

After reaching this temperature, let the steak rest inside the opened foil packets for at least 3 minutes. This resting period allows the juices to redistribute throughout the meat, ensuring every bite is tender and moist.

• Steaks, chops and roasts: 145°F (63°C) in the thickest part, then a 3-minute rest