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If you’ve never made foil packet steak in the Slow Cooker, this is the recipe that’s going to change your weeknights. The steak comes out incredibly tender and juicy, swimming in garlicky butter sauce — and it takes almost no effort to pull together. Four ingredients, and dinner basically makes itself.
Why You’ll Love It
Only 4 ingredients — steak, butter, garlic, salt. That’s the whole list.
Hands-off cooking — the Slow Cooker does everything while you do literally anything else.
Seriously tender steak — the foil seals in the steam and butter so it comes out juicy every single time, no fighting the skillet.
Almost zero cleanup — you throw away the foil. The Slow Cooker pot barely gets dirty.
Tastes way more impressive than it is — rich, savory, and satisfying in a way that feels like real cooking.
A Few Notes on the Ingredients
The steak: I usually go with sirloin because it’s reasonably priced and holds up well to the slow heat without getting stringy. Top round works too, though it comes out a little more pot-roast-adjacent in texture — not a bad thing, just different. I tried it with ribeye once and it was incredible but felt a little extravagant for a random Wednesday. You do what you want.
The butter: Unsalted, always. I want to control the salt myself, and a full stick for four pieces of steak sounds like a lot but it’s not, really — most of it ends up as the sauce you spoon over everything at the end. Don’t try to cut it back to be healthy. Just don’t. I tried that once and it was sad.
Garlic: Fresh cloves, minced fine. Not the jar stuff, not this time. The jarlic (that’s what my daughter calls it — “jarlic,” which I find both irritating and useful as a word) doesn’t melt into the butter the same way and Something about the flavor is just a little off. For four cloves — maybe five if they’re small, I eyeball it more than I probably should.
Salt: Kosher. I use Diamond Crystal because that’s what I’ve always bought and I’ve never really thought hard enough about switching.
Ingredients
2 pounds boneless steak (sirloin or top round), cut into 4 pieces — try to get them roughly even, thicker pieces take longer
1 stick (8 tablespoons) unsalted butter, softened — leave it out on the counter for a bit, cold butter doesn’t mix well
4 large garlic cloves, minced (or 5 if they’re small, really)
1 teaspoon kosher salt, plus a little more for the table
How to Make It
Tear off four big pieces of heavy-duty foil, about a foot long each. Regular foil is fine but it tears more easily when you’re folding and I’ve had packets come open at inopportune moments, so I really do think the heavy-duty is worth it. Crimp the edges up a tiny bit before you put the steak on — otherwise the butter slides right off while you’re assembling and you end up chasing it around the foil like a fool. Ask me how I know.
Mix your softened butter with the garlic and salt in a small bowl. Just mash it all together with a fork until it’s evenly combined. Taste a little — you want it salty enough to season the steak from the top, but not aggressively salty. I always taste it twice and then second-guess myself and add a little more salt anyway.
Pat your steak pieces dry. This matters. Wet steak doesn’t take seasoning as well and the texture of the final thing is better when you start dry. Set each piece in the center of a foil sheet, put a good mound of the garlic butter on top — I divide it roughly into fourths but I’m not scientific about it — and then fold everything up tight. Long sides up and over first, fold them down, then crimp the short ends in. You want it sealed. If butter leaks out into the Slow Cooker it’s not the end of the world but you do lose some of what makes this good.
Set the packets seam-side up in the slow cooker. They can touch each other, that’s fine. Cook on LOW — and I do mean LOW, please don’t try to do HIGH and cut the time, I did that once and the steak got weirdly tough and chewy and Rick ate it without complaining, which almost made it worse. LOW, three to four hours. Thinner pieces, check around three. Thicker, give it the full four.
When it’s done, let it sit with the lid on for another ten minutes or so. Then lift the packets out with tongs — they’re hot, and when you open them, tilt the foil away from your face because the steam is serious. Slide the steak onto a plate and pour everything from the packet over it. All of it. Don’t leave a drop.
Variations
My daughter-in-law makes hers with a tablespoon of fresh rosemary in the butter and it’s really lovely — a little more elegant than mine, which fits her personality, honestly. I’ve done Italian seasoning in there when I didn’t have fresh herbs and it works fine. A pinch of red pepper flakes if you want a tiny bit of heat.
I’ve also done a quick sear on the steak in a screaming hot skillet before I put it in the foil. You get a little color, a little crust, and something about it feels more like restaurant steak. Takes an extra five minutes and another pan to wash, so I only do it when I’m feeling ambitious or trying to impress someone. For a regular Thursday, I skip it.
Chuck steak works in this method too — it comes out almost like a braise, very soft, falls apart a little. Different vibe. More wintery, somehow.
Leftovers
There usually aren’t many. But if there are — wrap the steak back up in the foil and warm it in a 300-degree oven for about fifteen minutes. Or slice it thin and put it on top of a salad with whatever’s in the fridge. I’ve made it into sandwiches with a little garlic butter spread on the bread and that’s genuinely one of the better things I’ve eaten standing over the kitchen sink, which is where I eat most of my best meals, honestly.
The garlic butter that’s left in the foil is too good to throw away. I sometimes scrape it into a little container and use it on toast the next morning. Rick thinks this is excessive. He’s wrong.