The OXO Good Grips Chef’s Mandoline Slicer 2.0 is the best mandoline for thick cut sweet potatoes because its dial adjusts up to roughly 9 millimeters, which is thick enough for steak fries and roasting rounds, and its wide stainless frame stays stable under the pressure a dense sweet potato demands. Most mandolines are built for thin cucumber slices and stall or flex on hard vegetables. Below are four models that owners consistently report can actually handle the job, plus the safety gear you should pair with any of them.
The OXO Good Grips Chef’s Mandoline Slicer 2.0 is the best choice for thick sweet potato slices thanks to its wide thickness range and rigid, stable frame. The Swissmar Borner V-Slicer is the value alternative if you are happy with fixed insert thicknesses.
- Best overall: OXO Good Grips Chef’s Mandoline Slicer 2.0
- Best value: Swissmar Borner V-Slicer
- Best budget: Mueller V-Pro Multi Blade Mandoline
- Avoid: Flimsy handheld slicers with no thickness adjustment and no guard
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Quick Picks
- Best overall: OXO Good Grips Chef’s Mandoline Slicer 2.0, Dial-adjustable up to thick fry cuts with a rigid frame that will not flex on dense sweet potatoes.. Check price on Amazon
- Best value: Swissmar Borner V-Slicer, V-blade geometry shears through hard vegetables with less pushing force than straight blades..
- Best budget: Mueller V-Pro Multi Blade Mandoline, Swappable inserts and a serviceable guard for occasional thick slicing at a low cost..
Comparison Table
| Mandoline | Max thickness | Best for | Blade style | Buy |
|---|---|---|---|---|
| OXO Chef’s Mandoline 2.0 | Roughly 9 mm via dial | Steak fries and thick roasting rounds | Straight and wavy stainless blades | Check Price |
| Swissmar Borner V-Slicer | About 7 mm insert | Fast uniform cuts with less arm force | V-shaped blade | Check Price |
| Mueller V-Pro | Adjustable inserts | Occasional use on a budget | V-shaped blade | Check Price |
| Benriner Large Mandoline | About 5 mm adjustable | Precise thin to medium slices | Japanese straight blade | Check Price |
How We Chose These Food Processors Picks
We compared published thickness ranges, frame rigidity, and guard designs across the major mandoline brands, then weighed aggregated owner feedback specifically from people slicing hard vegetables like sweet potatoes and beets. Models that flexed, slipped, or could not exceed about 4 millimeters were cut from consideration.
Key Takeaway: For sweet potatoes, thickness range matters less than frame rigidity. A mandoline that flexes under pressure produces wedge-shaped slices and puts your hand at risk, so buy the most stable platform you can.
Best Overall: OXO Good Grips Chef’s Mandoline Slicer 2.0
Best for: Home cooks who regularly cut sweet potato fries, gratin rounds, or thick chips and want one adjustable tool instead of a set of insert blades. Why it made the list: It combines a genuinely wide thickness dial, a locking runway that stays rigid on hard produce, and one of the more confidence-inspiring hand guards in the category.
- Key specs: Dial-adjustable slice thickness from paper thin to roughly 9 mm, straight and wavy blade options, julienne settings, stainless steel runway, non-slip feet, and a large spiked food holder.
- What we like: The thickness dial clicks into set positions so every slice matches, and the frame does not bow when you push a dense sweet potato across it. The legs fold for storage and the feet grip wet counters well.
- What we do not like: It is bulky in a drawer, the blade assembly has crevices that need careful brushing when cleaning, and the price is high for a tool some people use twice a month.
- Who should buy it: Anyone who makes sweet potato fries, chips, or scalloped bakes often enough to want repeatable thick slices without knife work.
- Who should avoid it: If you only ever slice soft produce thin, a smaller handheld slicer does the same job in a quarter of the space and cost.
- Common complaints: Owners most often mention the learning curve of the guard on tapered vegetables and the careful handwashing the blade area requires.
- Size note: The folding legs raise the runway to a comfortable slicing height, but the unit needs a full drawer or a cabinet shelf, so measure your storage before buying.
- Cleaning note: Rinse immediately after slicing starchy vegetables, because dried sweet potato starch cements into the blade slots. Use a brush, not your fingers, near the edge.
- Alternative: The Benriner Large Mandoline is the pick if you value Japanese blade sharpness and mostly slice in the thin to medium range rather than thick.
Thick Cut Mandoline Buying Guide
Thickness range is the first filter
Most mandolines top out around 3 to 5 millimeters, which is too thin for steak fries or roasting rounds. For sweet potatoes you want at least 7 millimeters of adjustment, and a dial with locked positions beats loose inserts for repeatability. Check the actual specification rather than marketing photos.
Frame rigidity matters more on hard vegetables
A sweet potato takes several times the pushing force of a cucumber. Plastic-body mandolines can flex mid-stroke, which changes the slice thickness and can cause your hand to skate. Look for a stainless runway, wide stance, and grippy feet, and press on the platform in the store if you can.
Blade geometry changes the effort
V-shaped blades slice hard produce with a shearing action that takes noticeably less force than a single straight blade hitting the food head on. Japanese straight blades are sharper out of the box but demand more push on dense vegetables. Either works if the frame is stable and the edge is fresh.
Safety Notes
- Always use the hand guard or a cut-resistant glove, especially on the last third of the vegetable.
- Halve very large sweet potatoes flat-side down first so the food holder spikes can grip securely.
- Never wipe a mandoline blade with a sponge held in your bare hand, use a brush.
- Store the mandoline with the blade guarded or the thickness dial closed so a hand reaching into the drawer cannot touch the edge.
What to Avoid
- Handheld slicers with no adjustment, they cannot make thick cuts at all.
- Any mandoline that flexes visibly when you press the runway.
- Models whose guards only grip small, regular shapes, sweet potatoes are tapered.
- Ceramic-blade mandolines for hard produce, the edges chip on dense vegetables.
FAQ
Can a mandoline really cut sweet potato fries?
Yes, if it has a julienne or thick-slice setting near 9 millimeters and a rigid frame. You slice thick planks first, then run the planks through the julienne setting or knife-cut them into batons. Softer mandolines stall on whole raw sweet potatoes.
Should I microwave the sweet potato first?
Softening a very large sweet potato for about a minute can reduce slicing force, but do not cook it, a partially soft potato is harder to grip safely. Most medium sweet potatoes cut fine raw on a sharp, stable mandoline.
How thick should sweet potato slices be for roasting?
Roughly 6 to 9 millimeters holds together in the oven and gets crisp edges without drying out. Thinner than 4 millimeters is better for chips, and consistent thickness matters more than the exact number so everything finishes at the same time.
Final Verdict
The OXO Good Grips Chef’s Mandoline Slicer 2.0 is the best mandoline for thick cut sweet potatoes, with the Swissmar Borner V-Slicer as the lower-effort V-blade value pick and the Mueller V-Pro covering occasional use on a budget.
