Name: Oven-Baked 5-Ingredient Beef & Onion Foil Packet Dinner Recipe
Prep time: 15 min
Cook time: 35 min
Total time: 50 min
Cuisine: American
Ingredients: 1 1/2 pounds thinly sliced beef steak (such as sirloin or round); 2 large yellow onions, thinly sliced; 1 1/2 pounds baby potatoes, halved (or small potatoes cut into 1-inch chunks); 3 tablespoons olive oil; 2 teaspoons steak seasoning (or your favorite all-purpose seasoning blend); Salt and black pepper, to taste (optional, depending on your seasoning blend); Nonstick cooking spray (for foil, optional)

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Introduction

This oven-baked beef and onion foil packet dinner is a simple, flavorful meal perfect for busy weeknights. With just five key ingredients, it combines tender beef, sweet onions, and baby potatoes for an easy and satisfying dinner that cooks all in one packet.

The image shows a foil packet opened to reveal three strips of grilled steak with a brown, slightly charred outside, lying on a bed of roasted yellow and red baby potatoes and caramelized onion slices that are light brown with transparent edges. The food is sprinkled with chopped green herbs, adding a fresh touch. The foil is shiny and crinkled, forming a nest around the food. The background surface is a white marbled texture. Photo taken with an iphone --ar 4:5 --v 7

Ingredients

1 1/2 pounds thinly sliced beef steak (such as sirloin or round)
2 large yellow onions, thinly sliced
1 1/2 pounds baby potatoes, halved (or small potatoes cut into 1-inch chunks)
3 tablespoons olive oil
2 teaspoons steak seasoning (or your favorite all-purpose seasoning blend)
Salt and black pepper, to taste (optional, depending on your seasoning blend)
Nonstick cooking spray (for foil, optional)

Instructions

Step 1: Preheat your oven to 400°F (200°C). Line a large baking sheet with foil for easy cleanup. Tear off four large sheets of heavy-duty aluminum foil, about 12×18 inches each. Lightly spray the center of each with nonstick cooking spray if desired to prevent sticking.
Step 2: Prepare the vegetables by thinly slicing the onions and halving the baby potatoes (or cutting larger potatoes into 1-inch chunks). Pat the beef dry with paper towels and slice into strips if it isn’t already thinly sliced.
Step 3: In a large bowl, toss the potatoes and sliced onions with olive oil, steak seasoning, and a pinch of salt and pepper if using. This ensures even coating of the seasoning on all ingredients.
Step 4: Divide the seasoned onion and potato mixture evenly among the four foil sheets, placing it in the center of each. Top each pile with an equal portion of the sliced beef, spreading it out slightly for even cooking.
Step 5: Seal each foil packet by bringing the long sides up and folding them together tightly over the filling, then roll up the short ends to form a snug packet. Leave a small amount of space inside to allow steam circulation for cooking.
Step 6: Place the packets on the prepared baking sheet and bake for 30–35 minutes, or until the potatoes are tender when pierced with a fork and the beef is cooked through. For less-done beef, open the packets during the last 5 minutes to let steam escape and shorten cooking time slightly.
Step 7: Carefully open one packet to check potato doneness, watching out for hot steam. If the potatoes need more time, reseal the packet and bake for an additional 5–10 minutes.
Step 8: When cooked, remove from the oven and let the packets rest for 3–5 minutes before serving. Serve by opening the packets at the table and spooning any flavorful juices over the contents.

Tips & Variations

Try adding sliced bell peppers or mushrooms for extra vegetables in your foil packets.
Use different seasoning blends such as Cajun or Italian herbs to vary the flavor profile.
If you prefer, swap baby potatoes for sweet potatoes cut into similar-sized chunks for a slightly sweeter taste.
For a touch of richness, drizzle a small amount of butter over the beef before sealing each packet.

Storage

Store any leftover foil packet contents in an airtight container in the refrigerator for up to 3 days. To reheat, place in a microwave-safe dish and warm until heated through, or rewrap in foil and bake at 350°F (175°C) for about 15 minutes.

How to Serve

The image shows a large metal bowl filled with three layers: the bottom layer is sliced white onions, the middle layer is small, halved baby potatoes with a light brown skin covered in herbs and black pepper, and the top layer has a wooden spoon resting inside the bowl. Next to the bowl on the right side, there is a wooden board with several pieces of raw, red beef strips piled on it. Behind the wooden board, a small white bowl is filled with mixed spices, and a small clear bottle with olive oil is visible. All items rest on a surface with a white marbled texture. Photo taken with an iphone --ar 4:5 --v 7

Serve this delicious recipe with your favorite sides.

FAQs

Can I use frozen beef for this recipe?

For best results, use fresh or fully thawed beef. Cooking frozen beef in foil packets may result in uneven cooking, especially for thin slices.

What can I substitute for steak seasoning?

If you don’t have steak seasoning, a mix of garlic powder, paprika, onion powder, salt, pepper, and a pinch of dried thyme or oregano works well as a flavorful alternative.