Succulent sirloin steak cubes are seared until browned yet tender, then quickly combined with sautéed cremini mushrooms in melted garlic butter infused with thyme and lemon juice. The rich butter melds perfectly with the earthy mushrooms and flavorful steak, garnished with fresh parsley for a burst of herby brightness. Ready in under 30 minutes, this dish offers an elegant balance of savory and fresh notes, ideal for weeknight dinners or casual gatherings.
There's something about the sizzle of steak hitting hot oil that stops you mid-conversation. I learned that lesson on a Tuesday night when I threw together whatever was in my fridge—a couple handfuls of mushrooms, some butter, half a steak I'd been meaning to use. Twenty minutes later, my kitchen smelled incredible and I was plating up something that tasted like I'd actually planned it.
I made this for my sister when she was visiting and didn't want to fuss, but wanted to eat well. She kept asking what was in it, convinced I'd bought it from somewhere. The garlic butter coating everything was the moment she stopped asking questions and just ate.
Ingredients
- Sirloin steak, 1 1/2 lbs cut into 1-inch cubes: This cut is forgiving and cooks fast—you're looking for bites that are tender but still have character, not fancy enough to cry about if you sear them a beat too long.
- Olive oil (2 tbsp total): Divided between the steak seasoning and mushroom sauté, it keeps everything from sticking and helps develop that golden crust.
- Kosher salt and freshly ground black pepper: Don't skip the freshness on the pepper—pre-ground tastes like dust next to what you'll get from a grinder.
- Cremini or white mushrooms, 8 oz quartered: Quarter them so they get crispy edges; whole or sliced ones steam and get mushy.
- Unsalted butter, 4 tbsp: This is where the magic lives—real butter, good quality if you have it, makes the difference between good and unforgettable.
- Garlic, 4 cloves minced: Fresh garlic only here; that's non-negotiable when it's going raw into the butter.
- Fresh parsley and dried thyme: The parsley is brightness at the end, the thyme is depth—they're working together.
- Lemon juice, 1 tbsp: A squeeze at the very end that brings everything into focus and keeps it from feeling heavy.
Instructions
- Dry and season the steak:
- Pat your steak cubes completely dry with paper towels—this matters more than you'd think for getting a proper sear. Toss with olive oil, salt, and pepper and let them sit while you prep everything else; they'll come to room temperature and cook more evenly.
- Sauté the mushrooms first:
- Heat your skillet until a drop of water skitters across it, then add oil and mushrooms in a single layer without crowding. Let them sit undisturbed for a couple minutes until they brown on one side, then stir occasionally until they're golden and tender, about four to five minutes total. Move them to a plate.
- Sear the steak in batches:
- Don't crowd the pan—this is tempting to skip but it's why you get a crust instead of steam. Work in two batches if needed, laying the cubes in a single layer and leaving them alone for two minutes, then flipping and cooking another minute or two until the outside is brown but the inside is still pink.
- Build the garlic butter sauce:
- Lower the heat to medium, add butter to the empty skillet, and the moment it melts and smells toasty, add your minced garlic and thyme. Cook for thirty seconds—you're waking up the flavors, not browning anything.
- Finish and coat:
- Return the steak and mushrooms to the skillet with the butter and toss everything together for a minute so it all gets coated and warm. Finish with a squeeze of lemon and a handful of fresh parsley, and serve immediately.
This dish became my answer to the question I used to dread: what's for dinner? It's the kind of meal that feels indulgent but doesn't trap you in the kitchen, and somehow tastes better than recipes that ask for twice the effort.
Timing and Temperature Matter
Medium-rare is the sweet spot here—anything more cooked and your bites toughen up, anything less and you're not getting that sear. If you're nervous about doneness, remember that residual heat keeps cooking everything for a minute after it comes off the stove. Pull it when it feels ever so slightly underdone and you'll land exactly right.
Building Flavor in Small Spaces
A cast iron skillet is ideal because it holds heat evenly and builds up seasoning that adds flavor you can't get anywhere else, but any large skillet with decent heat retention will work. The key is that you're searing and then building a sauce in the same pan—every browned bit sticking to the bottom is flavor you're about to dissolve into that butter.
Making It Your Own
This recipe is a foundation that welcomes tinkering. Swap in different fresh herbs, add a pinch of red pepper flakes if you like heat, or stir in a splash of Worcestershire sauce when you melt the butter. The structure is just solid enough that it forgives your experiments.
- Ribeye or filet mignon work beautifully if you want to splurge, though sirloin does the job just as well.
- Serve it over mashed potatoes, cauliflower rice, or soft polenta to catch every drop of that butter.
- Leftovers reheat gently in a low oven, though honestly this is better fresh—make it when you want to eat soon.
This is the kind of weeknight dinner that makes you feel taken care of without taking care of you all evening. It's fast enough to be easy but tastes thoughtful enough that you'll find yourself making it again.
Frequently Asked Questions
- → What cut of steak works best for this dish?
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Sirloin steak cubes are preferred for their balance of tenderness and flavor, but ribeye or strip steak can also be used for a richer taste.
- → How can I ensure the steak bites remain juicy?
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Pat the steak dry before cooking and sear over medium-high heat without overcrowding the pan to retain moisture and achieve a nice crust.
- → Can I use a different type of mushroom?
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Yes, cremini mushrooms are ideal, but white button mushrooms or shiitake can be substituted depending on availability and preference.
- → What is the purpose of lemon juice in the dish?
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Lemon juice adds a subtle acidity that brightens the rich butter and steak flavors, balancing the overall savory profile.
- → How should I store leftovers?
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Store leftovers in an airtight container in the refrigerator and consume within 2 days. Reheat gently to maintain tenderness.