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This Costco mac and cheese copycat recipe delivers the same baked-to-golden perfection with its signature stretchy pulls and crispy top—just like the store-bought version you love. The secret lies in a two-step cheese sauce that prevents separation and a precise baking technique that creates that iconic crunch.
I’ve recreated this dish after testing multiple batches to match the exact texture and flavor profile.
The key to success is using a roux-based cheese sauce that blends sharp cheddar with cream cheese for that signature melt. We’ll boil pasta until it’s just shy of al dente, then toss it in the sauce before baking to golden-brown perfection.
This method ensures every bite has that creamy, stretchy quality that makes Costco’s version so addictive.
By the time it emerges from the oven, you’ll have a crispy, bubbling top with gooey, pull-apart cheese underneath—just like the original. The sauce clings to each noodle, creating that restaurant-quality experience at home. Ready to make this copycat masterpiece?
This recipe works as a standalone comfort dish or pairs perfectly with grilled chicken or steak. The leftovers reheat beautifully, making it ideal for meal prep. Let’s get started on recreating this crowd-pleaser!
Ingredients for costco mac and cheese copycat
Pantry staples meet restaurant-quality technique for that iconic Costco mac and cheese crunch and stretch.
| Ingredient | Amount | Notes |
|---|---|---|
| Elbow Macaroni 🍝 | 1 ½ lb | Medium or elbow shape preferred |
| Sharp White Cheddar Cheese 🧀 | 3 cups | Freshly grated, block preferred |
| Cream Cheese 🧈 | 8 oz | Full-fat, room temperature |
| Butter 🧈 | ¾ cup | Unsalted, cut into small pieces |
| All-Purpose Flour 🌾 | ½ cup | Sifted for smooth texture |
| Whole Milk 🥛 | 1 ½ cups | Room temperature preferred |
| Heavy Cream 🥛 | ½ cup | Full-fat for creaminess |
| Yellow Onion 🧅 | 1 whole | Finely diced, about 0.5 cup |
| Garlic Cloves 🧄 | 4 cloves | Minced, about 1 tsp |
| Salt 🧂 | 2 ½ tsp | Diamond Crystal kosher preferred |
| Ground Black Pepper 🌶️ | ½ tsp | Freshly ground preferred |
| Dried Mustard 🌿 | 1 tsp | For subtle tang |
| Panko Breadcrumbs 🍞 | ½ cup | For crispy top |
| Extra-Virgin Olive Oil 🫒 | 1 tbsp | For drizzling on top |
The cheese is the star—sharp white cheddar is non-negotiable for that signature tang. Grab a block and grate it yourself—pre-shredded gets clumpy and lacks flavor. Kraft 2% or Cabot work great if you're in a pinch, but nothing beats freshly grated. The cream cheese needs to be full-fat and room temperature—no low-fat shortcuts here. For the butter, unsalted is best since we're controlling the salt. If you're feeling fancy, European-style butter like Plugra adds extra richness. The pasta? Medium or elbow shape is key—it holds the sauce better than penne or shells.
No sharp cheddar? Pepper jack or smoked cheddar add depth, but you'll lose that signature tang. Ran out of cream cheese? Substitute with 4 oz cream cheese + 2 oz extra sharp cheddar for the same texture. The dried mustard can be swapped for 1 tsp Dijon mustard if you've got it. For the roux, butter and flour are essential—don't try oil here. The milk and cream should be room temperature to prevent lumps. If you're making this ahead, assemble the sauce and refrigerate overnight—it tastes even better the next day.
This reheats beautifully—cover with foil and bake at 375°F for 15-20 minutes until bubbly. Leftovers keep 4-5 days in the fridge, but honestly, it disappears faster than that. For meal prep, portion into individual containers before baking—just pop them in the microwave for 1-2 minutes when ready. The crispy top? Broil for 1-2 minutes at the end if it's not golden enough. Double the recipe—it's that good.
Why You'll Love This Recipe
- No Fuss, Big Payoff: I swear by this—just elbow mac, sharp cheddar, and cream cheese tossed in butter until it’s actually melty, not gloppy. The roux (flour + butter) takes two minutes, and suddenly you’ve got that signature thick, velvety sauce without standing at the stove for hours.
- Cheese Overload (In a Good Way): Between the sharp white cheddar’s tang and the cream cheese’s richness, this isn’t your childhood orange box stuff. The secret? Toast the flour in butter first—it deepens the flavor like magic. (Yes, even my picky husband stops mid-conversation to ask for seconds.)
- Party or Pantry: Slap it in a baking dish for game day, or serve it cold in lunchboxes—it’s that versatile. I’ve brought this to potlucks (where it disappears first) and packed it for road trips. Honestly, the only limit is your imagination—or how much cheese you’re willing to buy.
- Budget-Friendly Leftovers: A single batch feeds four, and the leftovers? Even better the next day. The sauce clings to the pasta like it’s afraid to let go, and reheating it just makes it creamier. Plus, you’re using bulk-store staples—no overpriced gourmet shortcuts needed. My wallet thanks me every time.
Step-by-step instructions for Costco mac and cheese copycat recipe
Here's how to nail that iconic Costco baked mac and cheese with perfect stretchy pulls and crispy golden crust.
Cook the Elbow Macaroni to Al Dente Perfection
Bring a large pot of water to a rolling boil and add the 1.5 lb elbow macaroni. Cook until 1 minute before the package recommends for al dente (usually about 10-11 minutes). This slight undercooking prevents mushiness when baked. Drain thoroughly but don't rinse—those starches are what'll make your sauce velvety.
While the pasta cooks, I like to add 1 tablespoon of the extra-virgin olive oil to the boiling water. This prevents sticking and adds a subtle richness that mimics the Costco version. The pasta should be tender but still have a slight bite—you'll finish cooking it in the oven.
Build the Ultimate Cheese Sauce Base
In a large Dutch oven or heavy pot, melt the 0.75 cup butter over medium heat. Add the finely diced yellow onion and cook for 5 minutes until soft and translucent. Stir in the minced garlic cloves and cook for 30 seconds until fragrant—this prevents raw garlic flavor that can overpower the dish.
Whisk in the 0.5 cup all-purpose flour and cook for 1-2 minutes until golden. This creates a roux that'll thicken your sauce beautifully. Slowly pour in the 1.5 cups whole milk and 0.5 cup heavy cream, whisking constantly to prevent lumps. Bring to a simmer and cook for 5 minutes until slightly thickened.
Incorporate the Cheese Mixture
Reduce heat to low and add the 8 oz cream cheese in small chunks, stirring until completely melted. This prevents curdling from heat shock. Then add 2 cups of the freshly grated sharp white cheddar cheese and the 1 tsp dried mustard, stirring constantly until fully combined and smooth.
Here's where the magic happens: fold in the cooked elbow macaroni until evenly coated. The sauce should be thick enough to cling to the noodles but still flow slightly. If it's too thick, add 1-2 tablespoons of pasta water to loosen it. Season with 2.5 tsp salt and 0.5 tsp ground black pepper—taste and adjust if needed.
Assemble and Bake to Golden Perfection
Transfer the macaroni mixture to a 9x13-inch baking dish, spreading it evenly. Sprinkle the remaining 1 cup sharp white cheddar cheese evenly over the top. In a small bowl, mix the 0.5 cup panko breadcrumbs with 1 tablespoon extra-virgin olive oil and sprinkle this mixture evenly over the cheese.
Bake at 375°F for 25-30 minutes until the top is deep golden brown and the edges are bubbling. The key is patience—don't peek! Every time you open the oven, you lose heat and steam that's crucial for that perfect crust. The internal temperature should reach 165°F when checked with an instant-read thermometer.
Rest and Serve with Stretchy Pulls
Remove from the oven and let rest for 10 minutes before serving. This resting period allows the cheese to set slightly, making those signature stretchy pulls even more dramatic. The top should be crispy enough to hold its shape when you run a knife through it, while the interior remains creamy and gooey.
Cut into squares and serve immediately. Each bite should deliver that perfect combination of crispy crust, creamy interior, and cheesy stretch that makes this dish legendary. The panko topping adds a satisfying crunch that contrasts beautifully with the velvety cheese sauce.
Pro Tips For Making Costco Mac And Cheese Copycat
- Cook pasta AL DENTE: That chewy bite isn’t optional—pull elbows when they’re just tender, about 1 minute before package time. I learned this the hard way when my first batch turned into mushy glue after mixing with the sauce. Trust the texture test: one bite should have a slight resistance.
- Grate cheese FINE: Skip the food processor unless you want grainy bits—use a box grater for sharp white cheddar, and fold in cream cheese in small chunks. My grandmother swore by this, and she was right: the sauce stays silky, not clumpy. (Yes, even if you’re impatient like me.)
- Melt butter SLOWLY: Warm the butter over medium-low heat until it’s just foaming—no browning. I used to rush this, and the sauce would split or taste burnt. Let it melt gently, then add flour to make the roux. It’s the thing that matters most for that creamy, velvety finish.
- Rest before serving: Give the finished mac and cheese a solid 5-10 minutes under foil before plating. The sauce thickens as it sits, and the cheese melts more evenly. I skip this when I’m lazy, but the dish is noticeably better when I don’t—less gooey, more cohesive. (Your future self will thank you.)
Common mistakes when making great costco mac and cheese copycat
Overcooking the Pasta
Stopping the pasta just shy of al dente is critical—overcooking turns it mushy when baked. I’ve ruined batches by following package times exactly, only to end up with a sad, gluey mess.
Always test a piece by biting into it—it should have a slight resistance. The starches released during undercooking are what create that velvety sauce cling. 🍝
Skipping the Roux
The roux is the backbone of the sauce’s thickness and richness. I once tried a shortcut by just melting cheese into milk, and the result was watery and separated.
Cook that flour and butter until golden—it’s what gives the sauce its body and prevents a runny disaster. Don’t rush this step!
Adding Cheese Too Quickly
Dumping all the cheese at once causes clumping and graininess. I learned this the hard way when my first attempt looked like cheese curds in a swamp. Add cream cheese first in small chunks, then stir until fully melted before incorporating the cheddar.
This gradual approach ensures a silky, smooth texture that mimics Costco’s signature creaminess. 🧀
Underseasoning Before Baking
Taste your sauce before baking—it’s easy to underseason because the flavors meld during cooking. I’ve had to add extra salt and pepper after baking, which ruins the balance. Season generously with salt, pepper, and mustard before assembling. The panko topping won’t compensate for blandness, so don’t skimp!
Peeking During Baking
Resist the urge to check on your mac and cheese early—every time you open the oven, you lose crucial heat and steam that build that perfect crust. I’ve seen well-intentioned cooks ruin golden tops by peeking too soon.
Set a timer and trust the process. The internal temp should hit 165°F—that’s your only guide.
Skipping the Rest Time
Serving mac and cheese immediately after baking means missing out on those legendary stretchy pulls. I’ve cut into it too soon and gotten a sad, runny mess.
Let it rest for 10 minutes—this allows the cheese to set slightly, creating that signature texture that makes every bite worth the wait. 💫
Nutrition facts
Frequently asked questions
Why does this recipe use elbow macaroni instead of penne?
The elbow shape holds the creamy sauce better than penne or shells, creating that signature stretchy pull when baked. The nooks and crannies trap more cheese sauce, delivering that restaurant-quality texture Costco's version is known for.
Can I make this mac and cheese ahead of time?
Assemble everything up to the baking step, then refrigerate for up to 24 hours before baking. The flavors actually improve overnight. For leftovers, reheat covered at 350°F for 15-20 minutes until bubbly. The texture stays creamy when reheated properly.
What if I don't have sharp white cheddar?
Use pepper jack for a spicy kick or smoked cheddar for depth, but you'll lose that signature tang. For a closer match, blend 2 cups sharp cheddar with 1 cup mild cheddar—the sharpness is what creates that signature flavor. Pre-shredded cheese won't work as well due to anti-caking agents.
How do I get the perfect crispy top?
The secret is the panko-oil mixture on top plus baking at 375°F until deep golden brown. For extra crispiness, broil for 1-2 minutes at the very end. Don't skip the rest time—10 minutes lets the cheese set slightly for that ideal texture contrast.
Can I make this gluten-free?
Yes! Swap the elbow macaroni for gluten-free pasta and use a gluten-free flour blend for the roux. The texture will be slightly different but still delicious. For extra richness, add 1 tablespoon cornstarch to the roux to help thicken the sauce properly.