Imagine tender, savory beef, sweet caramelized onions, and golden baby potatoes—all steamed to perfection in their own little flavor-packed pouch. That’s the magic of these 5-Ingredient Beef & Onion Foil Packets: a no-fuss, one-pan (well, one-foil!) meal that delivers big taste with minimal cleanup. Inspired by campfire cooking but perfected for your oven, it’s ideal for busy weeknights, lazy Sundays, or even backyard grilling. Just layer, seal, and bake—then tear open to reveal a steaming, aromatic feast.
Why You’ll Love This Recipe
Only 5 core ingredients (plus salt, pepper, and foil!)
Zero dishes—cook and serve in the same packet
Perfectly tender beef every time, thanks to steam-sealed cooking
Customizable—swap seasonings, add veggies, or go spicy
Great for meal prep, camping, or feeding a crowd
Ingredients
1½ lbs thinly sliced beef steak (sirloin, round, or flank—ask your butcher to slice it thin!)
2 large yellow onions, thinly sliced
1½ lbs baby potatoes, halved (or quartered if large)
3 tbsp olive oil
2 tsp steak seasoning (like Montreal blend, or mix: garlic powder + onion powder + smoked paprika + black pepper)
Salt and freshly ground black pepper, to taste (optional, depending on your seasoning)
Heavy-duty aluminum foil
Nonstick cooking spray (optional, for easy release)
💡 Pro Tip: No pre-sliced beef? Freeze a whole steak for 20 minutes, then slice paper-thin with a sharp knife.
Step-by-Step Instructions
(Simple—but don’t skip the foil seal!)
1. Prep & Preheat
Heat your oven to 400°F (200°C).
Line a rimmed baking sheet with foil for easy cleanup.
Tear off 4 large sheets of heavy-duty foil (about 12×18 inches). Lightly spray the center of each with nonstick spray (optional but helpful for release).
2. Divide & Layer
Evenly divide ingredients among the 4 foil sheets:
→ ¼ of the potatoes
→ ¼ of the onions
→ ¼ of the beef slices
Drizzle each portion with ¾ tbsp olive oil and sprinkle with ½ tsp steak seasoning. Add a pinch of salt/pepper if needed.
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