I can never resist a pile of crispy onion straws, with golden crunch giving way to sweet, tender onion in every bite. They make burgers, salads, and casseroles feel instantly crave-worthy.

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I’m obsessed with crispy onion straws because they hit that salty, crunchy, can’t-stop-grabbing-one-more spot every single time. Sweet onions turn into thin, golden ribbons with tender centers and shattery edges, and I swear they make everything more fun to eat.

I pile them on burgers, scatter them over salads, and yes, snack on them straight from the plate like I have zero self-control. But honestly?

Same. The light coating with all purpose flour gives them that crisp bite I crave, without hiding the onion flavor.

And that little crackle when I bite in. So good, it’s ridiculous.

Ingredients

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Sweet onions turn soft inside and crispy outside, with that mellow, snacky bite.
All purpose flour gives the coating body so it actually sticks.
Cornstarch is the crunch hero.
It keeps the straws light, not heavy.
Baking powder adds a little puff, so the crust doesn’t feel flat.
Kosher salt wakes everything up.
Without it, they’d taste pretty sleepy.
Black pepper brings a small bite that cuts through the fried richness.
Smoked paprika adds color and a cozy, smoky vibe you’ll notice.
Cayenne is optional, but it’s great if you like a tiny kick.
Garlic powder makes them taste more savory, like better diner onion rings.
Onion powder doubles down on that sweet onion flavor.
Basically, more onion magic.
Egg helps the coating grab on instead of sliding off.
Buttermilk adds tang and tenderness.
Plus, it helps the crust crisp up nicely.
Vegetable oil is what gets everything golden, crunchy, and seriously hard to stop eating.

Ingredient Quantities

2 large sweet onions (Vidalia or yellow), about 1 pound total

1 cup all purpose flour

1/3 cup cornstarch

1 teaspoon baking powder

1 teaspoon kosher salt

1/2 teaspoon freshly ground black pepper

1 teaspoon smoked paprika

1/4 teaspoon cayenne pepper (optional for heat)

1 teaspoon garlic powder

1/2 teaspoon onion powder

1 large egg

1 cup buttermilk (or 1 cup milk plus 1 tablespoon white vinegar)

Vegetable oil for frying, about 3 cups (enough for a 3 inch deep pot)

How to Make this

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1. Peel onions and cut into very thin strips about 1/8 inch wide using a sharp knife or mandoline, then separate into strands and place in a large bowl.

2. Whisk egg into the buttermilk (or milk plus vinegar) until combined and pour over the onion strips, toss lightly to coat, and let sit 10 minutes to mellow the onions and help the batter adhere.

3. In a shallow wide bowl combine flour, cornstarch, baking powder, kosher salt, black pepper, smoked paprika, cayenne if using, garlic powder, and onion powder; whisk to blend.

4. Heat about 3 cups vegetable oil in a heavy pot to 350 F using a thermometer; maintain 325 to 350 F while frying.

5. Working in small batches, lift a handful of onion strips from the buttermilk, allowing excess to drip off, then dredge and toss in the flour mixture until well coated. Shake off excess flour.

6. Gently drop coated onion strips into the hot oil in a loose mound so pieces do not stick together; fry 2 to 3 minutes or until golden brown and crispy.

7. Use a slotted spoon or spider to remove onion straws and transfer to a wire rack set over a baking sheet or paper towels to drain; immediately season with a little extra kosher salt if desired.

8. Repeat coating and frying with remaining onions in batches, avoiding overcrowding which will lower oil temperature.

9. If oil temperature drops below 325 F, allow it to return to 350 F between batches for the best crispness.

10. Serve warm as a topping for burgers, salads, or casseroles; reheat leftover straws in a 375 F oven for 5 to 7 minutes to restore crispness.

Equipment Needed

1. Sharp chef knife or mandoline
2. Cutting board
3. Large mixing bowl
4. Whisk
5. Shallow wide bowl or pie dish for dredging
6. Heavy pot or deep fryer (3 inch oil depth)
7. Frying thermometer (probe or clip-on)
8. Slotted spoon or spider and tongs
9. Wire rack set over a baking sheet or paper towels

FAQ

How can I make these gluten free? Substitute a 1:1 gluten free flour blend for the all purpose flour and ensure the cornstarch is certified gluten free. Frying method and timings remain the same.

Can I use a different onion? Yes. Sweet onions are mild and caramelize nicely, but yellow or white onions work well. Red onions are okay but will yield a stronger flavor and different color.

How do I keep them crispy if not serving immediately? Drain on a wire rack and keep in a single layer in a low oven at 200 F for up to 20 minutes. For longer storage, cool completely, store airtight, then reheat in a 375 F oven or air fryer for a few minutes to recrisp.

What oil is best for frying? Use a neutral, high smoke point oil such as vegetable, canola, or peanut oil for best flavor and safety.

Can I make these without an egg? Yes. Replace the egg and buttermilk with 1 cup buttermilk plus 2 tablespoons of cornstarch mixed in, or use a plant based milk with 1 tablespoon vinegar and a tablespoon of aquafaba or a commercial egg replacer to help the coating adhere.

How do I get uniformly thin slices? Use a sharp knife or a mandoline set to a thin setting to slice the onions evenly, which yields consistent frying and texture.

Easy Crispy Onion Straws Recipe Substitutions and Variations

All purpose flour: Use a 1:1 gluten free baking blend for a gluten free version, or swap for 1 cup rice flour for a lighter, crispier crust.
Cornstarch: Replace with arrowroot powder or potato starch in equal amounts for the same crisping effect.
1 large egg: For vegan or egg-free options use 1 tablespoon ground flaxseed mixed with 3 tablespoons water (let sit 5 minutes) or 3 tablespoons aquafaba.
1 cup buttermilk: Substitute 1 cup plain yogurt thinned with 2 to 3 tablespoons water or use 1 cup milk plus 1 tablespoon lemon juice or vinegar if not already on hand.

Pro Tips

1. Pat the onion strips very dry after the buttermilk soak. Excess surface moisture causes the flour mix to slide off and the oil to spit, so lay them on paper towels and gently press before dredging.

2. Use a thermometer and keep the oil between 325 and 350 F. If it falls too low the straws will absorb oil and become greasy; if it spikes they brown too fast. Adjust heat between batches rather than crowding the pot.

3. Cornstarch is the secret to extra crispness. Make sure it is well blended with the flour and spices so every strand gets a light, even coating instead of a clumpy shell.

4. Fry small, loose mounds so pieces separate in the oil. If some stick together, give them a quick nudge with a spider or tongs a few seconds after hitting the oil to encourage separation.

5. Season immediately after frying while the straws are still hot so the salt sticks. For make ahead, cool completely then re-crisp in a 375 F oven for 5 to 7 minutes right before serving.

Easy Crispy Onion Straws Recipe

Recipe by Dan Coroni

0.0 from 0 votes

I can never resist a pile of crispy onion straws, with golden crunch giving way to sweet, tender onion in every bite. They make burgers, salads, and casseroles feel instantly crave-worthy.

Servings

servings

Calories

348

kcal

Equipment: 1. Sharp chef knife or mandoline
2. Cutting board
3. Large mixing bowl
4. Whisk
5. Shallow wide bowl or pie dish for dredging
6. Heavy pot or deep fryer (3 inch oil depth)
7. Frying thermometer (probe or clip-on)
8. Slotted spoon or spider and tongs
9. Wire rack set over a baking sheet or paper towels

Ingredients

2 large sweet onions (Vidalia or yellow), about 1 pound total
1 cup all purpose flour
1/3 cup cornstarch
1 teaspoon baking powder
1 teaspoon kosher salt
1/2 teaspoon freshly ground black pepper
1 teaspoon smoked paprika
1/4 teaspoon cayenne pepper (optional for heat)
1 teaspoon garlic powder
1/2 teaspoon onion powder
1 large egg
1 cup buttermilk (or 1 cup milk plus 1 tablespoon white vinegar)
Vegetable oil for frying, about 3 cups (enough for a 3 inch deep pot)

Directions

Peel onions and cut into very thin strips about 1/8 inch wide using a sharp knife or mandoline, then separate into strands and place in a large bowl.
Whisk egg into the buttermilk (or milk plus vinegar) until combined and pour over the onion strips, toss lightly to coat, and let sit 10 minutes to mellow the onions and help the batter adhere.
In a shallow wide bowl combine flour, cornstarch, baking powder, kosher salt, black pepper, smoked paprika, cayenne if using, garlic powder, and onion powder; whisk to blend.
Heat about 3 cups vegetable oil in a heavy pot to 350 F using a thermometer; maintain 325 to 350 F while frying.
Working in small batches, lift a handful of onion strips from the buttermilk, allowing excess to drip off, then dredge and toss in the flour mixture until well coated. Shake off excess flour.
Gently drop coated onion strips into the hot oil in a loose mound so pieces do not stick together; fry 2 to 3 minutes or until golden brown and crispy.
Use a slotted spoon or spider to remove onion straws and transfer to a wire rack set over a baking sheet or paper towels to drain; immediately season with a little extra kosher salt if desired.
Repeat coating and frying with remaining onions in batches, avoiding overcrowding which will lower oil temperature.
If oil temperature drops below 325 F, allow it to return to 350 F between batches for the best crispness.
Serve warm as a topping for burgers, salads, or casseroles; reheat leftover straws in a 375 F oven for 5 to 7 minutes to restore crispness.

Notes

Below you’ll find my best estimate of this recipe’s nutrition facts. Treat the numbers as a guide rather than a rule—great food should nourish both body and spirit. Figures are approximate, and the website owner assumes no liability for any inaccuracies in this recipe.