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This 5-ingredient oven beef is the dinner you make when life is busy, the budget is tight, and you still want something that tastes like you actually tried. You throw raw beef strips into a casserole dish, stir together four pantry staples, pour it on top, and let the oven do the rest. The Sauce is rich and savory with a deep, dark backbone from the soy sauce — don’t skip it, you’d notice immediately if you did. Spoon it over rice, mashed potatoes, or egg noodles and you’ve got a meal everyone will ask for again.
Why You’ll Love This
Genuinely 5 ingredients — no olive oil, no broth, no hidden extras. Just five things, most of which you probably already have.
Almost zero hands-on time — mix, pour, cover, Bake. The oven does the work while you do everything else.
Incredibly tender beef — the foil traps the steam and the condensed soup keeps everything moist. Those strips practically fall apart by the time it’s done.
Budget-friendly — this is a real cheap dinner, not a “budget-friendly” recipe that somehow requires truffle oil.
Easy to customize — swap the soup, add veggies, stir in sour cream at the end. It’s forgiving and flexible.
A Note on the Ingredients
The beef: I usually grab whatever the store has labeled “stir-fry beef” or I’ll buy a cheaper cut and slice it thin myself. I’ve used sirloin strips, round steak, even some generic “beef for stew” that I just cut smaller — it all works fine. Thinner is better because you’re not braising a roast here, you want it to cook through in an hour. If the strips are thicker than about half an inch, give it the extra time.
The cream of mushroom soup: I use the regular Campbell’s. I know, I know — there are fancier versions. I’ve bought the “healthy request” kind before and I don’t think it mattered either way. What you want is condensed, not ready-to-serve. Do not add water to your can before mixing it into the sauce — the sauce recipe already includes water.
The dry Onion soup mix: One packet. This is where most of the seasoning comes from so don’t skip it. I’ve done the Lipton brand and also the store brand and both work. If you’ve got picky eaters or kids who will archaeologically examine their food for visible onion pieces, you can pulse the dry mix in the blender for about ten seconds to break it down finer. I used to do this when the kids were small.
The soy sauce: Regular soy sauce, just two tablespoons. I’ve used low-sodium when that’s what I had. The flavor is a little less punchy but still good.
Ingredients
– 1½ pounds beef strips (stir-fry beef or a steak cut thin — about half an inch or less)
– 1 can (10.5 oz) condensed cream of mushroom soup — don’t dilute it
– 1 packet dry onion soup mix (about 1 ounce — the standard envelope size)
– ½ cup water
– 2 tablespoons soy sauce
Let’s Make It
Preheat your oven to 350°F. Get your 9×13 glass casserole dish out and set it on the counter — you don’t need to grease it or prep it at all, which is one of the small joys of this recipe.
Lay your beef strips into the dish. Spread them out as much as you can — not perfectly, nobody’s grading you — but you want them reasonably flat so the sauce can get in around everything. Don’t worry if there are some layers. It all works out.
In a medium bowl, stir together the condensed soup, the dry onion mix, the water, and the soy sauce. It’ll look a little thick and a little dark and maybe slightly unappealing, and that’s fine — it smells amazing. Mix it until it’s mostly uniform.
Pour the sauce right over the beef. I take a spoon and nudge it around so most of the beef gets coated and the sauce seeps down into the gaps. Some pieces will peek out on top. That’s okay. They’ll steam.
Cover the whole dish tightly with aluminum foil. This is important — you don’t want the moisture escaping. The dish needs that steam to do its job on the beef. I always press the foil down around the edges a little just to be sure.
Bake for one hour. When you pull it out, be careful removing the foil because the steam that comes rolling out is genuinely hot. Give everything a gentle stir — the sauce should be bubbly and slightly thickened, the beef should look tender and a little darker than when it went in. Taste a piece. If it’s not quite where you want it, recover and give it another fifteen or twenty minutes. Some beef needs it, some doesn’t.
Let it sit for about five minutes before you serve it. I know it’s tempting to just go straight from oven to plate, but the juices settle a little and you get a better scoop. Taste the sauce and add a little salt and pepper if it needs it — sometimes it does, sometimes it doesn’t, depending on your soup mix.
Spoon it over rice or mashed potatoes or egg noodles. Whatever you’ve got. And get plenty of that gravy from the bottom of the dish — that’s the best part.
Changes and Swaps
If mushroom soup isn’t a hit in your house, cream of Chicken works fine and the flavor is a little milder. My youngest went through a phase where she would not touch anything mushroom-adjacent — I think she was about eleven — and the cream of chicken version got us through that.
You can stretch this dish without much effort. Slice up some mushrooms or a couple of onions and lay them on top of the beef before the sauce goes on. It adds bulk without changing the basic method at all. I’ve also stirred a tablespoon or two of brown sugar into the sauce when I wanted something a little sweeter — my husband likes it that way, I’m more neutral on it.
The stroganoff version: after it’s done baking, stir in about half a cup of sour cream, then slide the dish back into the oven uncovered for five minutes. It goes Creamy and rich and honestly that version over egg noodles is something else entirely.
For lower sodium, use the low-sodium versions of the soy sauce and the soup, and only use half the onion mix packet. Then salt at the end.
Leftovers
Leftovers keep for about three days in the fridge. I usually put them in a container with some of the sauce — don’t skimp on that — and reheat them in the microwave with a splash of water stirred in to loosen things up. If you try to reheat it without any added liquid the sauce gets very thick and almost pasty. Not terrible, but not quite right either.
I’ve eaten this cold before, straight from the container at 11pm, which I’m telling you because I think you should know the full picture of who is writing this recipe. It wasn’t bad.
One More Thing
I make this every year somewhere around April when everything feels like too much and dinner still has to happen anyway. There’s something almost comforting about how little it asks of you. You mix four things in a bowl. You pour them over beef. You wait an hour.
My son made this in his own apartment a couple years ago and texted me a picture of it in the dish, all saucy and bubbling, and I don’t know why but it made me a little emotional. The dumb onion soup casserole, making its way into the next generation.
Anyway. Serve it over something starchy. Don’t forget the rolls if you have them.
5-Ingredient Tax Season Oven Beef Strips
Ingredients
- 1 1/2 lb beef strips stir-fry beef or thin-sliced steak, about 1/2 inch thick or less
- 1 can condensed cream of mushroom soup 10.5 oz, undiluted
- 1 packet dry onion soup mix about 1 oz
- 1/2 cup water
- 2 tbsp soy sauce
Instructions
- Preheat the oven to 350°F.
- Place the beef strips in a 9x13-inch glass casserole dish and spread them out as evenly as possible.
- In a medium bowl, stir together the condensed cream of mushroom soup, dry onion soup mix, water, and soy sauce until mostly smooth.
- Pour the sauce over the beef strips.
- Use a spoon to nudge the sauce around so most of the beef is coated and the sauce settles into the gaps.
- Cover the dish tightly with aluminum foil, pressing the edges to seal in the steam.
- Bake for 1 hour.
- Carefully remove the foil and gently stir the beef and sauce.
- Check the beef for tenderness. If needed, cover again and bake for another 15–20 minutes.
- Let the beef strips rest for 5 minutes before serving.
- Taste the sauce and season with salt and black pepper only if needed.
- Serve over rice, mashed potatoes, or egg noodles with plenty of gravy.