Copycat Smashburger Haystack Onions Recipe
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| Light, crackly, and salty in all the right ways, these copycat Smashburger haystack onions bring burger-joint crunch to your kitchen. |
If you love that crispy, golden pile of thin fried onions from Smashburger, you are going to be very happy in your own kitchen today. This copycat Smashburger Haystack Onions recipe is crunchy, savory, and surprisingly easy to make at home with simple pantry ingredients.
These onions are the kind of topping that can wake up a burger, add crunch to a sandwich, or disappear straight off the tray before dinner even starts. Been there. The first time I made a batch at home, I told myself they were for burgers. A handful later, I had to start over.
If you have been searching for how to make Smashburger Haystack Onions, crispy fried onion strings, or the best burger onion topping recipe, this one is for you.
A Little Background on Smashburger and Haystack Onions
Smashburger built a big following with its smashed burgers, bold toppings, and craveable textures. The brand is known for layering flavor in a way that feels fun and a little over-the-top, in the best possible way. One of those standout toppings is the famous haystack-style onions.
Smashburger is a trademarked brand, so this is a copycat version inspired by the dish, not the official recipe.
What makes haystack onions so iconic? It is all about the texture. They are cut very thin, coated lightly, and fried until they turn light, crisp, and beautifully golden. They have that delicate crackle when you bite in, almost like onion rings and potato chips had a very tasty little cousin. You get the sweet flavor of onion, the salty fried coating, and that irresistible crunch all at once.
They are especially good piled high on burgers, but they also work on hot dogs, wraps, salads, casseroles, and even creamy mac and cheese.
Why You’ll Love This Copycat Recipe
- Easy ingredients you can find at any grocery store
- Crispy texture without a heavy batter
- Perfect burger topping for backyard cookouts and game day
- Beginner-friendly steps with clear frying tips
- Great for make-ahead prep if you want to slice onions in advance
Ingredients
This recipe makes about 6 servings as a topping or side garnish.
- 2 large sweet onions, such as Vidalia, peeled
- 1 1/2 cups all-purpose flour
- 1/4 cup cornstarch
- 1 teaspoon kosher salt
- 1/2 teaspoon black pepper
- 1/2 teaspoon garlic powder
- 1/2 teaspoon paprika
- 1 cup buttermilk
- Vegetable oil, canola oil, or peanut oil for frying
- Extra salt, to taste, for finishing
Optional for extra flavor:
- 1/4 teaspoon cayenne pepper
- 1/2 teaspoon onion powder
Prep Time, Cook Time, Yield, and Nutrition
- Prep time: 20 minutes
- Cook time: 15 to 20 minutes
- Total time: About 40 minutes
- Yield: 6 servings
Approximate nutrition per serving:
- Calories: 220
- Carbs: 28g
- Protein: 4g
- Fat: 10g
- Fiber: 2g
- Sugar: 5g
- Sodium: 260mg
Nutrition will vary based on oil absorption and exact onion size.
Best Onions for Haystack Onions
Sweet onions work best here because they fry up with a mellow, slightly sweet flavor that tastes a lot like restaurant-style onion straws. Yellow onions will work too, but they have a sharper bite.
If you want that classic Smashburger Haystack Onions copycat flavor, go with sweet onions and slice them very thin. Thin slices are the secret. Thick slices tend to feel more like onion rings, while these should be light and feathery.
How to Make Copycat Smashburger Haystack Onions
Take your time with this process, especially if you are new to frying. Once you get the hang of it, it feels easy and fun.
- Heat the oil.
Pour about 2 inches of oil into a deep heavy pot or Dutch oven. Heat the oil to 350°F. Use a thermometer if you have one. That temperature matters. If the oil is too cool, the onions soak up oil and get soggy. If it is too hot, they burn before they crisp. - Set up a draining station.
Line a baking sheet or large plate with paper towels. You can also place a wire rack over a sheet pan for even better draining. This helps keep the onions crispy instead of steamy. - Slice the onions.
Cut the onions in half from root to tip. Slice them into very thin half-moons. A mandoline works great here, but a sharp knife is fine too. Separate the slices gently with your hands so you get lots of thin onion strands. - Make the coating.
In a large bowl, whisk together the flour, cornstarch, salt, black pepper, garlic powder, and paprika. If you want a little heat, add cayenne now. - Dip in buttermilk.
Place the sliced onions in another bowl and pour the buttermilk over them. Toss well so the onions are lightly coated. Let them sit for 5 minutes. This helps the flour mixture cling to the onions. - Coat the onions.
Lift a handful of buttermilk-coated onions and let the extra drip off. Toss them in the flour mixture until evenly coated. Shake off the excess flour. You do not want thick clumps. A light coating is what gives haystack onions that delicate crunch. - Fry in small batches.
Add a small handful of coated onions to the hot oil. Do not crowd the pot. Fry for about 1 1/2 to 3 minutes, stirring gently with tongs or a spider strainer so they cook evenly. They should turn golden brown and crisp. - Drain and season.
Use a slotted spoon or spider strainer to remove the onions. Place them on the prepared paper towels or rack. Sprinkle lightly with salt while they are still hot. - Repeat.
Continue frying the remaining onions in batches. Let the oil return to 350°F between batches for the best texture. - Serve right away.
Haystack onions are best fresh, when they are at peak crunch. Pile them onto burgers, sandwiches, barbecue pulled pork, casseroles, or enjoy them as a snack with dipping sauce.
Helpful Tips for Extra Crispy Onion Strings
- Slice thin. Thin onion slices are the difference between onion strings and onion rings.
- Use cornstarch. It helps create a lighter, crispier coating.
- Do not overcrowd the pan. Too many onions at once lower the oil temperature.
- Salt after frying. Hot onions grab seasoning better.
- Serve soon. They are crispiest in the first hour.
Think of frying like a crowded elevator. If too many things go in at once, nothing moves the way it should. Small batches really do help.
Food Safety Tips
Since this recipe involves hot oil, a few simple safety steps matter.
- Use a deep, heavy pot and never fill it more than halfway with oil.
- Keep children and pets away from the stove while frying.
- Dry tools and hands well before working near hot oil to avoid splatters.
- Monitor oil temperature with a thermometer if possible.
- Let used oil cool completely before straining or disposing of it.
This recipe does not include meat, but if you are serving these onions on burgers, remember that ground beef should be cooked to 160°F for food safety.
Easy Home Kitchen Shortcuts
Want to make this recipe even simpler? Here are a few easy options.
- Use a mandoline slicer for fast, even onion slices.
- Mix the dry coating in a zip-top bag and shake the onions in batches.
- Buy sweet onions in bulk if making these for parties or cookouts.
- Keep them warm in the oven at 200°F on a wire rack for a short time while you finish other batches.
Can you air fry them? Yes, but the texture will be different. They can still be tasty, just less delicate and more roast-like than true fried haystack onions.
Quick air fryer version:
- Spray coated onions lightly with oil
- Place in a loose layer in the basket
- Air fry at 375°F for 8 to 12 minutes
- Shake halfway through and watch closely near the end
Serving Ideas
These crispy onions are not just for burgers. Try them on:
- Smash burgers
- Turkey burgers
- Hot dogs
- Chicken sandwiches
- Green bean casserole
- Baked mac and cheese
- BBQ pulled pork sandwiches
- Creamy soups for crunch on top
- Salads that need a salty, crispy finish
Honestly, they can do for a sandwich what croutons do for a salad. They bring texture, and texture keeps every bite interesting.
Allergy-Friendly and Diet Preference Modifications
One thing I always try to do with copycat recipes is make sure more people can enjoy them. If you have allergies, sensitivities, or food preferences, here are solid ways to adjust this recipe.
Gluten-Free:
- Replace the all-purpose flour with a gluten-free 1-to-1 flour blend.
- Add the cornstarch as written for crunch.
- Double-check that your spices and buttermilk are certified gluten-free if needed.
Dairy-Free:
- Replace buttermilk with unsweetened plain almond milk or oat milk mixed with 1 tablespoon lemon juice or white vinegar.
- Let the mixture sit for 5 minutes before using.
Vegan:
- Use plant-based milk plus lemon juice in place of buttermilk.
- Make sure your sugar, if using sweetened milk alternatives, fits your preferences.
- Fry in vegetable or canola oil.
Egg-Free:
- Good news: this recipe does not need eggs.
Corn-Free:
- Replace cornstarch with arrowroot starch or potato starch.
Lower-Sodium:
- Reduce the salt in the coating and season lightly after frying.
- Use them on foods with less salty toppings so the whole dish stays balanced.
Spicy Version:
- Add cayenne to the flour mix.
- Top finished onions with a little chipotle powder for smoky heat.
Paleo-Friendly Idea:
- Use cassava flour and arrowroot starch.
- Dip onions in unsweetened dairy-free milk with a splash of lemon juice.
- Results may be slightly more rustic, but still crispy and delicious.
Keto Note:
- Traditional haystack onions are not very keto-friendly because onions and flour both contain carbs.
- If you want a lower-carb option, try using very thin onion slices with almond flour and a little grated Parmesan, though the texture will be different.
Storage and Reheating
These are best fresh, but if you have leftovers, here is the best way to save them.
- Store in an airtight container in the refrigerator for up to 2 days.
- Reheat in a 375°F oven or air fryer for 3 to 5 minutes.
- Avoid the microwave if possible, since it softens the coating.
If they lose some crispness overnight, the oven usually brings them back better than you might expect.
Frequently Asked Questions
Are haystack onions the same as onion strings?
Pretty much, yes. Haystack onions are very similar to crispy onion strings or onion straws, usually served piled high.
Can I make them ahead?
You can slice the onions and mix the coating ahead of time, but fry them close to serving for the best crunch.
What oil is best for frying onions?
Use a neutral oil with a high smoke point, like canola, vegetable, or peanut oil.
Why did my onions come out soggy?
Usually it is one of three things: the oil was too cool, the pan was overcrowded, or the onions were coated too heavily.
Final Thoughts
This copycat Smashburger Haystack Onions recipe is the kind of simple kitchen win that makes homemade burgers feel extra special. A little crunch can go a long way, and these onions bring a lot of flavor without a lot of fuss.
If you make them, I would love to hear how you used them. Did they land on burgers? Casserole? Straight into your snack bowl? Leave a comment and share your twist. And if you know someone who loves restaurant copycat recipes, send this post their way.
Disclaimer
This recipe is a copycat recipe inspired by a popular restaurant dish. It is not the official recipe, and no knowledge of the actual proprietary recipe is implied. Smashburger is a registered trademark of its respective owner, and this post is not affiliated with, endorsed by, or sponsored by Smashburger.
Simply Copycat Recipes is also an Amazon Affiliate. This means we may earn from qualifying purchases made through links, at no extra cost to you.
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