Mashed Kohlrabi (Keto Mashed Potatoes Alternative)

Every low-carb diet eventually leads to the same question: what do I eat instead of mashed potatoes? Cauliflower is the default answer, and it works okay. But if you’ve eaten enough cauliflower mash to be tired of it — or if you’ve noticed that cauliflower mash never quite nails the texture — kohlrabi is worth trying.

Mashed kohlrabi isn’t a perfect replica of mashed potatoes. But it gets closer than most substitutes in one crucial way: the texture. Cooked kohlrabi has a natural creaminess that cauliflower can’t match. It tastes like itself — mild, slightly sweet, faintly earthy — but the mouthfeel, done right, is genuinely satisfying.

The Carb Comparison

Here’s why kohlrabi matters for keto and low-carb eating (see our full kohlrabi nutrition facts for more):

	Kohlrabi	Potato	Cauliflower
Calories (per cup, cooked)	48	134	29
Total Carbs	11g	31g	5g
Fiber	1.8g	3g	2g
Net Carbs	9.2g	28g	3g
Protein	3g	3g	2g
Fat	0.2g	0.1g	0.3g

Kohlrabi sits between cauliflower and potato in the carb spectrum. It has more net carbs than cauliflower, but a fraction of what potatoes bring. For most keto eaters staying under 20-30g net carbs per day, a serving of mashed kohlrabi fits comfortably.

Cauliflower wins on pure carb numbers, yes. But kohlrabi wins on texture and flavor. If you’re choosing between a low-carb side that you tolerate and one you actually look forward to, the extra few grams of carbs are worth it.

Basic Mashed Kohlrabi Recipe

Ingredients

• 2 pounds kohlrabi (about 3-4 medium bulbs), peeled and cut into 1-inch cubes
• 2 tablespoons butter
• 2 tablespoons heavy cream or cream cheese
• 1/2 teaspoon garlic powder (or 2 cloves roasted garlic)
• Salt and white pepper to taste

Instructions

1. Peel the kohlrabi. Learn how to peel kohlrabi properly — peel deeper than you think, as the outer layer is fibrous and will leave strings in your mash. You should see smooth, pale flesh with no visible fibers.

2. Boil until very tender. Place the cubes in a pot, cover with salted water, and bring to a boil. Reduce to a simmer and cook for 20-25 minutes, until the kohlrabi is completely soft — a fork should pass through with zero resistance. Don’t undercook this. For mashing, you want it softer than you would for cubed preparations.

3. Drain thoroughly. This is the most important step. Drain the kohlrabi in a colander and let it sit for 5 minutes. Then — and this matters — press the cooked kohlrabi gently with the back of a spoon or a clean towel to squeeze out additional water. Kohlrabi holds more moisture than potatoes, and skipping this step results in a watery, thin mash.

4. Mash. Return the drained kohlrabi to the pot over low heat. Mash with a potato masher for rustic texture, or use an immersion blender or food processor for a smoother result. Add the butter and cream while mashing.

5. Season. Add garlic powder (or mash in the roasted garlic), salt, and white pepper. Taste and adjust.

6. Optional: dry it out. If the mash is still thinner than you’d like, stir it over low heat for 3-5 minutes. This evaporates excess moisture and tightens up the texture. Stir constantly to prevent sticking.

Serves 4 as a side dish.

The Water Problem (And How to Solve It)

Kohlrabi is about 91% water. Potatoes are about 79%. That 12-percentage-point difference doesn’t sound like much, but it matters enormously when you’re trying to make a thick, creamy mash. If you just boil kohlrabi, mash it with butter, and serve, you’ll get soup.

Here’s how to deal with it:

Drain aggressively. Don’t just pour off the cooking water. Let the kohlrabi sit in a colander for several minutes, then press it. Some people spread the cooked cubes on a kitchen towel and pat them dry.

Cook off the moisture. After mashing, keep the pot on low heat and stir for a few minutes. You’ll see steam rising — that’s moisture leaving. The mash will thicken as it dries out.

Use cream cheese instead of cream. Cream cheese adds richness and body without adding liquid. Two tablespoons of cream cheese do more for the texture than two tablespoons of heavy cream. If you want both creaminess and thickness, cream cheese is the move.

Add a thickener (optional). A tablespoon of parmesan cheese or a teaspoon of xanthan gum can help. Parmesan is the more natural choice and adds umami. Xanthan gum is invisible flavor-wise but very effective — use sparingly, because too much makes the texture gummy.

Don’t add cooking water back. With mashed potatoes, you might reserve some cooking liquid to loosen the mash. Do not do this with kohlrabi. You’re fighting the opposite problem.

Flavor Variations

Plain mashed kohlrabi is good. But its mild flavor is a canvas, and it takes additions well.

Garlic and Chive Mash

Add 4-5 cloves of roasted garlic (or 1 teaspoon garlic powder) and 2 tablespoons of finely chopped fresh chives. The garlic adds depth; the chives add a fresh, oniony brightness. This is the variation that most closely mimics loaded mashed potatoes.

Parmesan and Black Pepper

Stir in 1/3 cup finely grated parmesan and a generous amount of freshly cracked black pepper. The parmesan adds salt, umami, and body (which helps with the texture issue). This is the richest-tasting variation without being heavy.

Roasted Garlic and Brown Butter

Brown the butter before adding it to the mash. Melt 3 tablespoons of butter in a small pan over medium heat, swirling occasionally, until it turns golden and smells nutty, about 3-4 minutes. Combine with 4-5 cloves of roasted garlic (squeeze the soft cloves out of a roasted head) and mash into the kohlrabi. Brown butter adds a depth that regular butter can’t touch.

Cheddar and Bacon

Fold in 1/2 cup shredded sharp cheddar and 3-4 slices of crumbled bacon. This is the “loaded” version. Not the most keto-pure option if you’re strict about calories, but the macros still work: the fat from cheese and bacon, the protein from bacon, and the relatively low carbs from kohlrabi. Top with an extra sprinkle of cheese and a few chive cuts.

Horseradish Mash

Stir in 1-2 tablespoons of prepared horseradish. The sharpness cuts through the mildness of the kohlrabi in a way that’s especially good alongside roast beef or steak. Start with less — you can always add more.

Tips for the Best Results

Use medium-sized kohlrabi. Large bulbs tend to be woodier. Tennis-ball to softball sized is the sweet spot.

An immersion blender makes the smoothest mash. A potato masher gives you rustic texture; an immersion blender or food processor gives you the smooth consistency that mimics real mashed potatoes. Don’t over-process or it gets gluey.

Make it ahead. Stores 3 days in the fridge. Reheat on the stovetop over low heat with a splash of cream.

Season generously. Kohlrabi is mild — underseasoning is the most common mistake.

When to Serve It

Mashed kohlrabi works anywhere you’d serve mashed potatoes:

• Under braised meats or pot roast (see more kohlrabi recipe ideas)
• Next to a grilled steak or roasted chicken
• As the base for shepherd’s pie (use it instead of the potato topping)
• With gravy — yes, it takes gravy well
• Alongside Thanksgiving turkey, if your household is open to a lower-carb option

It also works where mashed potatoes would be too heavy — alongside fish, lighter proteins, and spring vegetables.

Is It Better Than Cauliflower Mash?

Cauliflower has fewer carbs. Kohlrabi has better texture. Cauliflower has a stronger flavor that some people love and others find sulfurous. Kohlrabi is milder and more neutral.

Try both and decide for yourself. And there’s no rule against mixing them — a 50/50 blend gives you the best texture from kohlrabi and the lowest carbs from cauliflower.