Crispy Sweet Potatoes

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Start by soaking sweet potato slices to reduce starch, then coat with cornstarch and spices, bake on hot trays and flip partway. Let them sit in the turned-off oven to finish crisping. Pair with avocado garlic aioli made in a blender.
Hannah Author
Updated on Wed, 26 Mar 2025 12:57:33 GMT
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Crunchy sweet potato wedges with garlic avocado dip combine just the right mix of textures and tastes for a mouthwatering snack or side. That hard-to-get crunch—usually missing from sweet potatoes—is totally within reach thanks to a few key but simple tricks that turn these healthy spuds into something you'll really crave.

I stumbled on the water-soaking trick completely by chance when I got sidetracked while cooking dinner. Stuck with potatoes soaking in water, I just went ahead anyway and couldn't believe how much crunchier they turned out! Now I never skip this step for wedges that vanish from the plate in seconds.

Ideal Potato Selection

  • Go for sweet potatoes with flat, even sides for easier cutting—try to find ones with regular shapes without many bends or lumps
  • Pick medium-sized ones for wedges that brown evenly without burning
  • The orange-fleshed kinds (sometimes called "yams" in US stores) give you that wonderful sweet caramelization
  • Skin on or off is up to you—skinless gives smoother texture while skin-on adds a rustic look and extra nutrients
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Crunchy Cooking Technique

Smart Cutting

First cut your sweet potatoes down the middle lengthwise, then split each piece again. Keep cutting until you've got wedges around ¾-inch thick. Making them all the same size means they'll cook together—you don't want some pieces burnt while others stay raw inside.

Water Bath Magic

Drop your cut wedges in cold water for at least an hour. This might seem fussy but it makes all the difference—it pulls out extra starch from the potatoes which normally stops them from getting crispy. You'll notice the water turns a bit cloudy as the starch comes out.

Complete Drying

When done soaking, drain the wedges and dry them fully with paper towels. Any water left will kill your crunchiness, so don't rush this part. Once they're dry, mix them gently with cornstarch, which forms a super-thin layer that soaks up any leftover moisture while baking.

Tasty Coating

Mix your wedges with olive oil and a combo of paprika, garlic powder, onion powder, chili powder, cayenne (more or less depending on how spicy you want), and dried thyme. Stick to dried herbs instead of fresh ones—fresh herbs have moisture that works against your crunch goal.

Hot Pan Trick

Here's another game-changer: stick your baking trays in the oven while it heats up. When you put your seasoned wedges on these hot pans, they start sizzling right away, giving that crucial first sear. Leave plenty of room between them—crowding leads to steaming instead of crisping.

Salt Timing

Wait until the wedges come out golden and crunchy from the oven before adding salt. Salting before cooking pulls out moisture and ruins crispness. A dash of flaky sea salt right when they're hot gives you that perfect sweet-salty mix.

Smooth Dipping Sauce

While waiting for your wedges, throw ripe avocado, garlic, a bit of mayo, lemon juice, and fresh herbs into a small food processor or blender. After a quick blend, you've got the perfect smooth partner for your crunchy wedges—the cool, garlicky sauce balances the sweet spiciness just right.

My next-door neighbor dropped in once while these were cooking and hung around for 20 minutes just to try them. She said she was "just dropping off mail" but kept finding excuses to stick around as the smell filled my kitchen. When I finally let her try some, she took one bite and straight away asked how I made them. Now she brings them to every group dinner and claims they're her creation—but I know exactly where she learned that soaking trick!

Ways To Enjoy

Dish up these wedges right from the oven when they're crunchiest, with the avocado dip in a small bowl on the side. They go great with grilled chicken or burgers, or add them to a spread of snacks for watching sports. For a full plant-based meal, have them with a big salad or veggie burger.

Tasty Twists

Mix things up with a sweet-hot combo by adding a spoon of brown sugar or maple syrup to your spice blend. For something totally different, try curry powder, cumin, and a touch of cinnamon for Moroccan-style wedges. If avocados aren't your thing, these taste just as good with regular garlic dip, spicy mayo, or even a tangy yogurt sauce.

Keeping Leftovers

These wedges taste way better fresh out of the oven, but if you have extras, keep them in a paper bag instead of a sealed container—this helps them stay somewhat crispy by stopping moisture buildup. Warm them in a hot oven (skip the microwave) for about 5 minutes to bring back some crunch. The avocado dip stays good for up to two days in the fridge if you press plastic wrap right onto its surface to stop it from turning brown.

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Smart Cooking Tips

  • Slice against the grain of the sweet potato so your wedges won't fall apart
  • When you're really rushed, even soaking for 30 minutes will make them noticeably crunchier
  • A quick spritz of oil just before serving adds extra shine and richness

The first time I served these to my fussy nephew, he eyed them suspiciously and told me he "couldn't stand sweet potatoes." After watching everyone else chow down, he grudgingly tried one—then ate seven more! Now when his family visits, he asks if we're having "the orange fries" before he's even through the door. Sometimes the best way to win over veggie haters is just to make them super crunchy!

Frequently Asked Questions

→ Why soak sweet potatoes before cooking?
Soaking gets rid of extra starch on the sweet potatoes' surface, which helps them crisp up in the oven. This small step makes a big difference in texture.
→ Is cornstarch needed for this recipe?
Cornstarch gives the best crunch, but it’s optional. Skipping it means your wedges won't be as crispy, though they'll still taste great with the seasonings.
→ How can I stop the aioli from turning brown?
The lemon juice slows browning, but putting plastic wrap against the surface of the aioli and storing it in the fridge also helps. Use within a day for the best results.
→ Can I prep these ahead of time?
The wedges taste best freshly baked, but you can prepare the sweet potatoes and whip up the aioli a few hours in advance. Bake the potatoes right before serving.
→ Why is salt added at the end?
Adding salt too early draws out moisture, which can mess with the crispy texture. Sprinkling it on after baking gives the perfect crunchy finish.
→ Can I cook these using an air fryer?
Yep! Cook at 380°F for about 15 minutes, shaking the basket halfway. Don’t overcrowd—do small batches if needed.

Crispy Sweet Potatoes

Crispy sweet potatoes baked to perfection, served with a creamy garlic-avocado dipping sauce. A coating of cornstarch ensures amazing crunch without frying.

Prep Time
30 Minutes
Cook Time
30 Minutes
Total Time
60 Minutes

Category: Family Treasures

Difficulty: Intermediate

Cuisine: American

Yield: 8 Servings

Dietary: Vegetarian, Gluten-Free, Dairy-Free

Ingredients

→ Sweet Potato Wedges

01 2 tbsp olive oil
02 1-2 tbsp cornstarch or cornflour
03 2 big sweet potatoes, washed and sliced into long pieces

→ Seasoning

04 2 tsp garlic powder
05 2 tsp sweet paprika
06 ½ tsp onion powder
07 2 tsp dried thyme
08 ¼ tsp cayenne pepper
09 ½ tsp optional chili powder
10 Sea salt as needed

→ Avocado Garlic Aioli

11 1 ripe, large avocado
12 2 tbsp full-egg mayo
13 1 minced garlic clove
14 2 tsp freshly squeezed lemon juice
15 A pinch of sea salt

Instructions

Step 01

Put the sweet potato wedges in a big bowl. Cover them with cold water and leave them to soak for at least 1 hour to reduce the starch.

Step 02

Move oven racks to the top section. Heat your oven to 450°F (230°C). Spray or grease two baking trays lightly, and let them warm up in the oven too.

Step 03

Drain the soaked wedges and dry them well with paper towels. Put the cornstarch into a large bag with a zipper, toss in the wedges, puff some air into the bag, zip it up, and give it a solid shake till they're well coated.

Step 04

Put the coated wedges into a bowl and remove any extra starch. Pour the olive oil on top, sprinkle with all the seasonings except salt, and mix everything together.

Step 05

Take the hot trays out of the oven and lay the wedges out in a single layer, making sure to leave at least half an inch between each one. Bake them for about 15-20 minutes, just until a fork slides in easily.

Step 06

Turn the wedges over, keeping space between them, and bake again for another 5-10 minutes until they’re crisp on the outside and golden-brown here and there.

Step 07

Turn the oven off, crack open the oven door, and let the wedges sit inside for around 5 minutes. This lets them dry out a bit more for ultimate crispiness.

Step 08

While your wedges finish up, toss the avocado, mayo, garlic, and lemon juice into a mini processor or blender. Blend for around 20 seconds till it’s smooth. Sprinkle on a bit of salt to balance out the flavors.

Step 09

Once hot, sprinkle salt over the wedges and serve alongside the avocado aioli for big dips.

Notes

  1. Soaking the potato wedges is a must—it helps make them crispier by pulling out the starch.
  2. Don’t pack the wedges too close together on the baking tray. Airflow is what helps that crunchy texture!
  3. You can make the aioli a day before. To keep it fresh, press plastic wrap directly onto its surface so it doesn’t turn brown.

Tools You'll Need

  • 2 baking trays
  • Large zipper bag
  • Paper towels
  • Cooking tongs
  • Blender or small food processor

Allergy Information

Please check ingredients for potential allergens and consult a health professional if in doubt.
  • Eggs are present due to the mayonnaise.

Nutrition Facts (Per Serving)

It is important to consider this information as approximate and not to use it as definitive health advice.
  • Calories: 178
  • Total Fat: 10 g
  • Total Carbohydrate: 22 g
  • Protein: 2 g