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Dinner · Part 2 of 3: Instructions

Garlic Butter Steak Foil Packets for an Easy Dinner Step-by-step instructions

A beautifully plated garlic butter steak foil packet with tender steak, golden potatoes, and vibrant green asparagus.
Prep
Cook
Total
Serves
4
Includes 5 min resting

Before you start

Before beginning the assembly, ensure the steak is cut into uniform, bite-sized pieces to promote even cooking. Wash the potatoes thoroughly and cut them into equal halves. Trim the woody ends off the asparagus and cut the stalks into manageable lengths.

Have your heavy-duty aluminum foil sheets ready on a large work surface to streamline the assembly process, and preheat your oven to 400°F (200°C) so it is ready for the packets.

Ingredients at a glance (5)
  • 1 1/2 lb sirloin steak, cut into bite-sized chunks
  • 1 lb baby potatoes, halved
  • 1 bunch fresh asparagus, trimmed and cut into pieces
  • 4 tbsp unsalted butter, softened
  • 3 cloves garlic, minced

Instructions

Flavor Preparation

  1. Prepare the Garlic Butter
    In a small bowl, combine the softened butter and minced garlic. Stir until the mixture is well incorporated and smooth. Set this garlic butter aside until you are ready to assemble the foil packets for the oven.
    Look for The butter should be soft enough to easily mix with the garlic.
    Tip Using room temperature butter makes incorporating the garlic much easier.

The garlic butter should be uniform in color and texture, with the minced garlic evenly distributed throughout the softened butter. The aroma should be fresh and inviting, signaling that the base for your flavor infusion is ready to be applied to the main components of the dish.

Packet Assembly

  1. Assemble the Foil Packets
    Lay out four large sheets of heavy-duty aluminum foil. Divide the steak chunks, halved baby potatoes, and trimmed asparagus pieces evenly among the four sheets. Place a dollop of the garlic butter on top of each pile of ingredients.
    Look for Ensure the ingredients are spread in a single layer to promote even cooking.
    Tip Fold the edges of the foil tightly to create a sealed pouch, which traps the steam inside.

Each of the four foil packets should be well-sealed with no visible gaps or tears. The ingredients should be arranged in a way that allows for efficient heat transfer, ensuring that the steak and vegetables are positioned to cook thoroughly in their own juices once they are placed in the hot oven.

Final Cooking

  1. Cook the Packets
    Place the sealed packets on a baking sheet and bake in a preheated oven at 400°F (200°C) for 15 to 20 minutes, or until the potatoes are tender. Carefully open the packets to check the steak, ensuring it reaches an internal temperature of 145°F (63°C). Let the steak rest for at least 3 minutes before serving to ensure it remains juicy and tender.
    Look for The steak should be medium-rare and the potatoes should be fork-tender.
    Safe temperature 145°F (63°C) internal temperature (steaks, chops and roasts)
    Tip Use caution when opening the packets, as hot steam will escape immediately.

The packets should appear slightly puffed from the steam trapped inside. When opened, the steak should show a beautiful sear, and the potatoes should be soft and golden.

The garlic butter should have melted completely, creating a savory liquid at the bottom of the packets that is ready for serving.

Common mistakes

A common mistake is overcrowding the packets, which can lead to uneven cooking of the potatoes and steak. Another error is failing to seal the foil tightly, which allows steam to escape and results in dry ingredients.

Ensure that the butter is distributed evenly among the packets so that each serving receives the same amount of seasoning and moisture, which is crucial for achieving the intended flavor profile in every single portion.

How to tell it’s done

The steak is done when it reaches an internal temperature of 145°F (63°C) for a perfect medium-rare finish. The potatoes are done when they can be easily pierced with a fork.

Using a meat thermometer is the most accurate way to verify the internal temperature of the steak pieces, ensuring they remain juicy and tender without becoming overcooked or tough during the final minutes in the hot oven.

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

Coming up in Part 3: common questions

  • Can other cuts of meat be used for this recipe?
  • How can the potatoes be ensured to cook through?
  • Can these packets be prepared in advance?

Also in Part 3: variations (Spicy Garlic Butter, Roasted Mushroom Addition), storage and make-ahead, and the printable recipe card.

Up next · Part 3 of 3

2 variations · storage & make-ahead · 3 answers · printable card

Tips, FAQ & printable recipe (Part 3)← Back to the ingredients (Part 1)