Sweet Potato Thang Copycat Recipe: Celery-Mayo Crunch Meets Velvety Spiced Potatoes

This Sweet Potato Thang copycat recipe delivers the same addictive combination of crispy, spiced sweet potato fries and creamy celery-mayo sauce you crave from the fast-food favorite.

The secret lies in perfectly seasoned fries that stay crispy while maintaining tender centers, paired with a tangy, crunchy dipping sauce that cuts through the richness. I've refined this recipe after countless batches to ensure every bite matches the original's bold flavors and satisfying crunch.

What sets this copycat version apart is the two-step baking process that creates that signature crispy exterior without deep-frying. The sweet potatoes are first roasted to develop natural sweetness, then finished in the oven with a precise blend of spices that mimics the restaurant's signature seasoning.

The celery-mayo sauce gets its signature crunch from finely chopped celery and a touch of Dijon mustard, creating the perfect balance of creamy and tangy.

By the time you're done, you'll have a restaurant-quality dish that's crispy, flavorful, and impossible to eat just one serving of. The fries maintain their crunch even when dipped, and the sauce delivers that signature tangy crunch in every bite.

This recipe serves 4 and comes together in about 45 minutes, making it perfect for game day, movie nights, or whenever sweet potato cravings strike.

The best part? This copycat version is healthier than the original while delivering identical satisfaction. You can easily scale it up for parties or meal prep the fries ahead and store them in the freezer. Let's get started on recreating this fast-food classic at home!

Ingredients for sweet potato thang copycat

Get ready to recreate that iconic restaurant crunch and creaminess with these carefully chosen ingredients.

The sweet potatoes are the star—orange-fleshed varieties like Beauregard work best. Grab the pre-cut fries section at Whole Foods or Trader Joe's for convenience, but if you're cutting your own, aim for even 1/4-inch sticks. The celery should be crisp with no brown spots—organic celery from the produce section has more flavor. For the mayo, Hellmann's or Duke's are my go-to brands—they hold up best in the sauce. The smoked paprika is non-negotiable; Penzeys sells the perfect blend for copycat recipes.

No smoked paprika? Regular paprika plus a pinch of liquid smoke gets you close. Running low on Dijon? Yellow mustard at half the amount works in a pinch. The cornstarch is the secret weapon for that signature crunch—don't skip it. For the spices, spice blends from the bulk section are fresher than pre-mixed packets. If you're making this for a crowd, double the sauce ingredients but keep the fries-to-sauce ratio at 2:1. The lemon juice should be freshly squeezed—bottled just won't cut it for that bright tang.

Store the fries in an airtight container for up to 3 days—they're best served at room temperature. The sauce keeps for 5 days in the fridge, though it's best made fresh. For meal prep, bake the fries ahead, cool completely, then freeze in a single layer before transferring to bags. They reheat beautifully in the oven at 400°F for 5-7 minutes. The sauce can be frozen for 3 months—just give it a good stir after thawing.

Step-by-step instructions for sweet potato thang copycat recipe

Here's how to recreate that iconic celery-mayo crunch with velvety spiced potatoes—just like the restaurant version.

Start by peeling the 2 lbs sweet potatoes and cutting them into ¼-inch thick fry shapes—think French fry length but square-cut for even cooking. Soak them in cold water for 10 minutes to remove excess starch, then drain and pat completely dry with paper towels. This step prevents soggy fries and ensures crispiness.

In a large bowl, toss the dried sweet potatoes with 0.25 cup olive oil, 1.5 tsp salt, 0.5 tsp black pepper, 1 tsp smoked paprika, 0.5 tsp garlic powder, 0.5 tsp onion powder, 0.25 tsp ground cumin, and 0.125 tsp cayenne pepper. Mix thoroughly until every piece is evenly coated—this is where the signature restaurant flavor comes from. Let the seasoned potatoes sit for 10 minutes while you prep the celery sauce, allowing the spices to penetrate slightly.

Preheat your oven to 425°F and arrange the seasoned sweet potatoes in a single layer on two parchment-lined baking sheets, leaving ½-inch space between each piece. This spacing ensures even browning and crispiness. Roast for 25 minutes, then flip each piece and return to the oven for another 20-25 minutes until they're deep golden brown with caramelized edges.

Here's the thing—don't walk away during the last 10 minutes. The potatoes should develop a crispy exterior that gives way to a creamy interior when pierced with a fork. If they're browning too quickly, tent the sheets with foil to prevent burning. The goal is that perfect balance of texture: crispy outside, tender inside.

While the potatoes roast, finely chop the 1 whole celery stalk (you should have about ¼ cup when chopped) and set aside. In a small bowl, whisk together 0.5 cup mayonnaise, 1 tbsp Dijon mustard, 1 tbsp lemon juice, and 1 tbsp cornstarch. The cornstarch is key—it adds that signature crunch and helps thicken the sauce just right.

Stir in the chopped celery and let the mixture sit for 5 minutes to allow the flavors to meld. Taste and adjust seasoning with additional salt or black pepper if needed. The sauce should be thick but still pourable—if it's too thick, add 1 tsp water to loosen it. This sauce is what makes the Sweet Potato Thang so addictive: creamy, tangy, and packed with crunch.

Once the sweet potatoes are perfectly roasted, transfer them to a large serving bowl. Drizzle the celery-mayo sauce over the top and gently toss until every piece is coated. The sauce should cling to the crispy potatoes, creating that irresistible crunch with every bite. If you're feeling extra, sprinkle with an additional pinch of smoked paprika for a pop of color and smoky depth.

Serve immediately while the potatoes are still crispy—this dish doesn't wait. The contrast of the crunchy, caramelized sweet potatoes with the cool, creamy celery sauce is what makes this copycat recipe so darn good. Pair with a side of pickles or a cold beer for the full experience, just like you'd get at the original spot.

Wine and beer pairings for this sweet potato thang copycat

Crispy Potato Pairings

The creamy, tangy celery-mayo sauce needs a refreshing contrast to balance its richness. Serve with dill pickle spears (sliced into bite-sized pieces) to cut through the sweetness and add a salty crunch. I love using Heinz bread-and-butter pickles for their sweet-tangy flavor that complements the smoky spices perfectly. 🥒

Light Beer Complements

A crisp, light lager like Miller Lite or Coors Light is my go-to pairing—its mild carbonation and clean finish cleanse your palate between bites.

For something with a little more character, try a wheat beer like Blue Moon or Hoegaarden, which adds a citrusy note that mirrors the lemon in the sauce. Both options enhance the dish without overpowering it.

Smoky IPA Balance

If you prefer bolder flavors, a hoppy IPA like Fat Tire Amber Ale or Stone Delicious IPA works surprisingly well. The bitterness from the hops balances the sweetness of the potatoes, while the alcohol cuts through the creamy sauce.

I recommend chilling your IPA for at least 30 minutes before serving to enhance its refreshment factor.

Wine Surprise Pairing

For a non-beer option, reach for a dry Riesling—its bright acidity and subtle fruitiness complement the sweet potatoes beautifully. The slight sweetness in the wine echoes the natural sweetness of the potatoes without clashing.

A chilled glass of White Zinfandel also works if you prefer something fruitier and more approachable. 🍷

Non-Alcoholic Options

Don't want alcohol? Sparkling San Pellegrino or LaCroix in citrus flavors like lemon or lime provide the same refreshing contrast. For a creamy non-alcoholic option, try ginger beer—its spicy kick pairs wonderfully with the smoky spices on the fries.

I keep a chilled can of Feather Ginger Beer on hand for these occasions.

Regional Beer Twist

In the South, where Sweet Potato Thang originated, Shiner Bock is a local favorite pairing. Its malty sweetness and slight roasted notes complement the caramelized potatoes beautifully. For a West Coast twist, try a California Common like Anchor Steam—its smooth profile lets the dish shine without competition. 🍺

Frequently asked questions