Step-by-Step Instructions
1. Preheat the Oven
Preheat oven to 400°F (200°C). Tear off 4 large sheets of heavy-duty foil, large enough to fully wrap each portion.
2. Prepare the Onions
Place sliced onions in a bowl. Drizzle with olive oil or melted butter and sprinkle with half the salt and pepper. Toss until evenly coated.
3. Season the Steak
Cut steak into 4 even portions. Pat dry with paper towels and season both sides with remaining salt and pepper.
4. Assemble the Packets
Lay foil sheets flat. Divide onions evenly in the center of each sheet, creating a bed. Place one steak portion on top of each pile. Spoon any remaining oil or seasoning over the steak.
5. Seal the Foil
Fold the foil tightly over the steak and onions, sealing the edges well to trap steam inside.
6. Bake
Place foil packets on a baking sheet. Bake for 20–25 minutes for medium doneness. Add a few extra minutes for well-done steak or tougher cuts.
7. Rest and Serve
Let packets rest for 5 minutes before opening. Carefully open (watch the steam!) and spoon the onions and juices over the steak before serving.
What to Serve With Beef & Onion Foil Packets
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Mashed potatoes or baked potatoes
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Steamed green beans or carrots
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Dinner rolls or biscuits
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Simple side salad
Tips for the Best Foil Packet Dinner
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Seal foil tightly to prevent juices from leaking
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Cut steak evenly for consistent cooking
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Let rest before opening to keep meat juicy
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Use heavy-duty foil to avoid tearing
Storage Instructions
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Store leftovers in an airtight container in the refrigerator for up to 3 days
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Reheat gently in the oven or microwave
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Not recommended for freezing due to texture changes
General Information
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Prep Time: 10 minutes
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Cook Time: 20–30 minutes
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Total Time: About 40 minutes
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Yield: 4 servings
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Category: Beef
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Method: Oven Baked
