Oven Baked Beef & Onion Foil Packet

This Oven-Baked Beef & Onion Foil Packet meal is a perfect example of simple cooking with great results. When the steak and onions are sealed inside foil, the trapped steam gently cooks everything together. The onions turn soft, sweet, and almost caramel-like, while the beef stays juicy and tender. The secret is the “onion bed” technique—placing the steak on top of the onions keeps it from touching the foil, allowing it to cook in flavorful juices rather than directly against the metal.

Oven-Baked Beef & Onion Foil Packet

Ingredients

• Beef steak (sirloin, round, or chuck) – 1½–2 lbs
• Large onions, thinly sliced – 2
• Olive oil or melted butter – 3 tbsp
• Salt – 1½ tsp
• Black pepper – 1 tsp

Instructions

Step 1: Prepare the Oven and Foil
Preheat your oven to 400°F (200°C). Cut four large sheets of heavy-duty aluminum foil.

💡 Tip: If you only have regular foil, use two layers to prevent tearing and keep the steam sealed inside.

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Step 2: Season the Ingredients
Place the sliced onions in a bowl and toss them with the olive oil (or melted butter) along with half of the salt and pepper.
Pat the steak dry with paper towels, then season both sides with the remaining salt and pepper.

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Step 3: Create the Onion Base
Add a mound of seasoned onions to the center of each foil sheet. Place a portion of steak directly on top of the onions.

💡 Tip: Pour any extra oil or seasoning from the onion bowl over the steak to boost flavor.

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Step 4: Seal the Foil Packets
Bring the long sides of the foil together over the steak and fold them down tightly. Fold the ends to create a sealed packet, making sure no steam can escape.

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Step 5: Bake
Arrange the foil packets on a baking sheet and bake for 20–25 minutes for medium doneness.

💡 Tip: If you’re using tougher cuts like round or chuck, cook closer to 25 minutes or slightly longer so the connective tissue softens.

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Step 6: Rest and Serve
Remove the packets from the oven and let them sit for about 5 minutes before opening. This resting time helps the juices settle back into the meat, keeping the steak moist when sliced.