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Master your beef loin New York boneless thin-cut from Costco with this recipe—pan-searing it into a crisp, buttery masterpiece at home is easier than you’d think. The secret lies in precise temperature control and a simple seasoning approach that enhances the beef’s natural richness without overpowering it.
I’ve cooked this cut dozens of times, and the difference between a dry steak and one that melts in your mouth comes down to just a few key steps.
This method works perfectly for Costco’s thin-cut beef loin, which cooks quickly and evenly, making it ideal for weeknight dinners or special occasions. You’ll need just 15 minutes of active prep followed by 10 minutes of searing, ensuring minimal effort for maximum impact.
The goal is medium-rare—125–130°F internal temperature—where the beef remains tender yet develops that coveted caramelized crust. No fancy marinades or long rests required; just salt, pepper, and patience.
What you’ll end up with is a perfectly seared steak—crisp on the outside, velvety and juicy within—ready to slice against the grain for even, tender bites. Pair it with roasted potatoes, chimichurri, or grilled asparagus to complete the meal.
The beauty of this recipe is its adaptability: whether you’re cooking for two or feeding a crowd, the technique scales effortlessly. Let’s get started on creating your best steak yet.
For Costco shoppers, this recipe makes the most of their high-quality, budget-friendly beef loin by focusing on technique over complexity. Trimming excess fat and letting the steak rest after cooking are the two most critical steps—skip them, and you’ll miss out on the full potential of this cut.
The result? A steak so good, you’ll wonder why you ever bought anything else.
Ingredients for beef loin new york boneless thin cut costco
Costco beef loin, olive oil, butter, and a few simple seasonings—everything you need for a restaurant-quality steak at home.
| Ingredient | Amount | Notes |
|---|---|---|
| Beef Loin New York Boneless Thin-Cut Steak 🥩 | 1 ½ lb | Costco beef loin, trimmed of fat |
| Kosher Salt 🧂 | 1 ½ tsp | Coarse grain preferred |
| Freshly Ground Black Pepper 🌶️ | 1 tsp | Freshly cracked for best flavor |
| Extra-Virgin Olive Oil 🫒 | 2 tbsp | High smoke point preferred |
| Unsalted Butter 🧈 | 2 tbsp | Cold, cut into small cubes |
| Garlic Cloves 🧄 | 2 cloves | Minced for finishing |
| Fresh Rosemary 🌿 | 1 sprig | Chopped, for garnish |
| Fresh Thyme 🌿 | 1 sprig | Chopped, for garnish |
| Red Wine Vinegar 🍷 | 1 tbsp | For finishing sauce |
| Heavy Cream 🥛 | ¼ cup | Full-fat for richness |
| Fresh Parsley 🌿 | ¼ cup | Chopped, for garnish |
| Meat Thermometer 🌡️ | 1 whole | For precise doneness |
The Costco beef loin is your secret weapon here—it’s lean but tender, perfect for quick searing. Grab the thin-cut New York boneless from the meat section, and trim any visible fat with kitchen shears. Look for bright red color and firm texture—avoid anything with grayish edges. I always buy mine from Costco’s butcher counter because they cut it fresh for me, but the pre-packaged version works too. The key is letting the steak come to room temperature for 30 minutes before cooking, so plan ahead. If you’re short on time, a quick 10-minute rest on the counter still helps.
No fresh rosemary or thyme? Dried works at half the amount, but fresh gives that bright, aromatic finish. Running low on butter? Ghee or high-quality shortening works in a pinch for searing—just don’t use margarine. The heavy cream can be swapped for half-and-half or whole milk, though it’ll be slightly lighter. For the olive oil, avocado oil has a higher smoke point if you’re worried about burning. And if you don’t have red wine vinegar, a splash of lemon juice or balsamic vinegar does the trick. The garlic is optional but adds a nice aromatic punch—skip it if you’re not a fan.
This steak is best served immediately, but if you need to hold it, keep it warm in a 200°F oven for up to 15 minutes. The butter-cream sauce can be made ahead and reheated gently—just add a splash of warm water if it thickens too much. Leftovers keep for 2 days in the fridge, though honestly, it’s that good you’ll likely eat it all the first night. For freezing, portion the steaks individually and freeze them uncooked—they’ll keep for up to 3 months. Just thaw overnight in the fridge before cooking.
Why You'll Love This Recipe
- Costco Scorecard: I swear, that vacuum-sealed steak from Costco? It’s already prepped for me—no trimming, no fuss. Just pull it out, pat it dry, and you’re halfway there.
- Butter-Basted Magic: The secret’s in the butter. Sear those thin cuts in olive oil first, then baste with melted butter until the edges are golden and the center stays juicy. That crispy crust? Chef’s kiss.
- Weeknight or Date Night: Same recipe, different vibes. Toss it on the grill for a summer dinner or pan-sear it for a fancy-ish weeknight meal. No one’s asking for a fancy setup—just great steak.
- Leftovers That Don’t Suck: Cold slices? Perfect for sandwiches. Reheat in a skillet with a splash of broth, and it’s just as tender. Honestly, I make double portions just for this.
Step-by-step instructions for perfectly pan-seared beef loin
Here's the method that guarantees a perfect crust and tender interior every time.
Prep and Season the Steak
Take the 1.5 lb beef loin New York boneless thin-cut steak out of the refrigerator and let it sit at room temperature for 30 minutes. This ensures even cooking throughout. Pat the steak dry completely with paper towels—this step is crucial for achieving that perfect crust. Any moisture on the surface will prevent the steak from searing properly.
In a small bowl, combine the 1.5 teaspoons kosher salt and 1 teaspoon freshly ground black pepper. Rub this mixture evenly over both sides of the steak, pressing gently so the seasoning adheres. Let the steak rest for another 10 minutes before cooking. This resting period allows the salt to penetrate the surface slightly, enhancing flavor and ensuring even seasoning.
Sear the Steak to a Golden Crust
Heat a heavy skillet—cast iron works best—over medium-high heat until it's very hot. Add 1 tablespoon of the extra-virgin olive oil and let it get shimmering hot for about 1 minute. Place the steak in the skillet and cook for 3-4 minutes on one side, pressing down gently with a spatula during the first minute. This prevents the steak from curling and ensures even contact with the pan.
Flip the steak and add the 2 tablespoons unsalted butter cut into small cubes along with the 2 cloves minced garlic. Cook for another 3-4 minutes until the steak reaches an internal temperature of 125°F on the meat thermometer. You'll know it's ready when the edges are golden brown and the steak releases easily from the skillet. Remove the steak to a plate and tent loosely with foil to keep it warm.
Prepare the Herb Cream Sauce
Reduce the heat to medium and add the 1 sprig chopped fresh rosemary and 1 sprig chopped fresh thyme to the skillet. Let them sizzle for about 30 seconds until fragrant. Pour in the 1 tablespoon red wine vinegar and scrape up any browned bits from the bottom of the pan. These bits are packed with flavor and will enrich your sauce.
Add the 0.25 cup heavy cream and let the mixture simmer gently for 2-3 minutes until it thickens slightly. Taste and adjust seasoning with additional salt or pepper if needed. Keep the sauce warm while you prepare the final garnish.
Rest and Serve with Fresh Herbs
Let the steak rest for 5-10 minutes before slicing. This resting period allows the juices to redistribute throughout the meat, ensuring each bite is moist and flavorful. While the steak rests, chop the 0.25 cup fresh parsley finely for garnish.
Slice the steak against the grain into 0.5-inch thick pieces. Spoon the herb cream sauce over the top and garnish with the chopped fresh parsley. Serve immediately with your favorite sides. The result should be a steak with a perfect golden crust and tender, buttery interior that practically melts in your mouth.
Pro Tips For Making Beef Loin New York Boneless Thin Cut Costco
- Pat Dry First: Thin-cut steaks like these need every bit of moisture rendered out for a proper crust. I learned this the hard way—skipping the paper towel step means your olive oil and butter will just steam off instead of searing. Take 30 seconds to blot both sides; it’s the difference between a dull pan and a screaming-hot crust.
- Salt Before Searing: Don’t wait until the last minute—season the steaks generously with kosher salt at least 40 minutes before cooking. This lets the salt penetrate the thin cut and start breaking down the surface proteins, which actually helps the butter cling better later. (Yes, even if you’re impatient like me.)
- Start Hot, Finish Low: These steaks are thin but dense—crank your pan to medium-high heat until it’s smoking before adding oil, then lower to medium after the first minute. After 30 seconds of searing, pull them off just before they hit your target temp (they’ll carryover). I used to overcook them by rushing the finish.
- Butter Last, Not First: Tossing butter in at the start just makes a greasy mess. Instead, add a pat of unsalted butter after the steaks have seared for 20 seconds—it’ll foam up and baste them perfectly. A splash of olive oil first (about 1 tbsp) ensures the butter doesn’t burn before it can work its magic. (Your future self will thank you.)
Flavor customization for these flavors
Classic Herb Butter
Stick with the original herb butter sauce for a timeless, elegant finish. The combination of rosemary, thyme, and garlic in the butter creates a fragrant crust while the heavy cream adds richness.
For extra depth, deglaze the pan with 1 tbsp red wine vinegar to capture all those flavorful browned bits. This sauce pairs beautifully with the steak’s natural beefy notes without overpowering them. 🌿
Spicy Chimichurri
Swap the cream sauce for a vibrant chimichurri by blending 0.5 cup parsley, 0.25 cup cilantro, 2 garlic cloves, 2 tbsp red wine vinegar, 0.5 cup olive oil, and 1 tsp red pepper flakes.
The bright, herby, and slightly spicy chimichurri cuts through the richness of the steak while adding a fresh, tangy contrast. Let it sit for 10 minutes before serving to let the flavors meld. 🌶️
Garlic and White Wine Reduction
For a more sophisticated sauce, create a garlic-white wine reduction. After searing the steak, remove it from the pan and deglaze with 0.5 cup dry white wine. Add 2 minced garlic cloves and 1 tbsp butter, then simmer until reduced by half.
Strain and drizzle over the sliced steak for a silky, aromatic sauce. This works especially well with Costco’s leaner cuts, adding moisture and complexity. 🍷
Smoky BBQ Glaze
For a bold, smoky twist, brush the steak with a homemade BBQ glaze made from 0.5 cup ketchup, 2 tbsp apple cider vinegar, 1 tbsp brown sugar, 1 tsp smoked paprika, and 1 tsp liquid smoke.
Simmer for 5 minutes until thickened, then brush onto the steak during the last 2 minutes of cooking. The glaze caramelizes beautifully, adding a sweet, smoky crust that contrasts perfectly with the steak’s buttery interior. 🔥
Lemon-Herb Compound Butter
For a lighter, citrusy option, make a lemon-herb compound butter by mixing 4 tbsp softened butter, 1 tbsp lemon zest, 1 tbsp chopped parsley, 1 tsp lemon juice, and a pinch of salt.
Roll into a log, chill for 30 minutes, then slice and place on top of the steak just before serving. The bright lemon cuts through the richness while the herbs add freshness. This is a great choice if you prefer a cleaner, brighter flavor profile. 🍋
Mushroom and Thyme Pan Sauce
For an earthy, umami-rich sauce, sauté 1 cup sliced mushrooms in the same pan after removing the steak. Add 1 tbsp butter, 1 sprig thyme, and 2 tbsp beef broth, then simmer until the mushrooms release their juices.
Stir in 1 tbsp heavy cream and a splash of white wine to finish. This sauce adds depth and pairs wonderfully with the steak’s natural flavors. 🍄
Nutrition facts
Frequently asked questions
Why does my Costco beef loin turn out tough instead of tender?
The most common mistake is skipping the resting time before and after cooking. Let the steak sit at room temperature for 30 minutes before searing, then rest for 5-10 minutes after cooking. Overcooking is another culprit—use a meat thermometer to hit 125–130°F for medium-rare. Thin cuts like this cook fast, so watch closely after 3 minutes per side.
Can I grill this beef loin instead of pan-searing?
Preheat your grill to medium-high (400°F) and oil the grates well. Sear for 4-5 minutes per side for a 1.5 lb steak, then move to indirect heat to finish cooking. A cast-iron skillet on the grill works too—just place it over the heat source. The key is the same: 125–130°F internal temp and resting before slicing.
How do I adjust this recipe for thicker beef loin cuts?
For thicker cuts (over 1.5 inches), increase cooking time by 1 minute per side or use a two-zone fire on the grill. Let the steak rest 10-15 minutes to redistribute juices. If worried about dryness, baste with melted butter during the last 2 minutes of cooking. Always check with a thermometer—125°F for medium-rare.
What sides pair best with this steak?
Roasted garlic mashed potatoes or crispy smashed potatoes balance the richness perfectly. For freshness, try grilled asparagus with lemon or a simple arugula salad with balsamic. Heartier options include creamy polenta or buttery cornbread. The herb cream sauce also works as a light pasta sauce with fettuccine.
Can I make this ahead of time?
Prep the steak the night before by trimming fat, seasoning, and refrigerating uncovered for 12 hours (this enhances flavor). Cook it fresh for best results, but you can reheat sliced steak in a 200°F oven for 10 minutes if needed. The sauce can be made ahead and reheated gently—just add a splash of warm water if too thick. Never reheat leftovers above 165°F.