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To thicken up cauliflower mashed potatoes, you need to remove excess moisture and add ingredients that bind the mixture together.
If you’ve ever made cauliflower mashed potatoes and ended up with a soupy, watery mess, you’re not alone.
Cauliflower holds a lot of water, and when you mash or blend it, that water releases and turns your “mashed potatoes” into something closer to cauliflower soup.
The good news is that you can absolutely thicken up cauliflower mashed potatoes with a few simple tricks.
In this post, we’ll look at why cauliflower mashed potatoes get watery in the first place, how to thicken them up, and how to prevent the problem next time.
Let’s dive in.
Why Cauliflower Mashed Potatoes Get Watery
Cauliflower mashed potatoes get watery because cauliflower is roughly 92% water.
When you boil, steam, or blend cauliflower, those cell walls break down and release all that liquid.
Unlike regular potatoes, cauliflower doesn’t have much starch to absorb that moisture.
So the water just sits there, making your cauliflower mashed potatoes thin and runny.
Here’s what’s usually happening:
1. You Boiled the Cauliflower
Boiling is the biggest culprit behind watery cauliflower mashed potatoes.
When you boil cauliflower, it soaks up water like a sponge.
Then when you mash it, all that absorbed water comes right back out.
Steaming or roasting gives you a much drier starting point.
2. You Didn’t Drain It Well Enough
Even after steaming, cauliflower holds onto moisture.
If you don’t drain it thoroughly and let it cool slightly to release steam, that leftover water ends up in your bowl.
Patting the florets dry with a clean kitchen towel before mashing makes a huge difference.
3. You Blended Instead of Mashed
Blenders and food processors break cauliflower down into a puree that releases even more water.
A potato masher or fork gives you a chunkier texture and keeps some of the structure intact.
If you do use a food processor, pulse it in short bursts and stop before it turns into soup.
How to Thicken Up Cauliflower Mashed Potatoes
Now for the part you came here for — how to actually thicken up cauliflower mashed potatoes.
You’ve got several options, and the best one depends on what you have in your kitchen.
1. Strain or Squeeze Out the Liquid
The fastest fix is to remove the excess liquid.
Transfer your cauliflower mashed potatoes to a fine-mesh strainer and let them sit for a few minutes.
You can also wrap the mashed cauliflower in cheesecloth or a clean kitchen towel and gently squeeze.
This alone can transform a watery batch into something thick and creamy.
2. Add a Thickening Agent
If straining isn’t enough, add something that absorbs moisture.
Good options include grated Parmesan cheese, cream cheese, or a spoonful of almond flour.
Parmesan adds flavor and structure, while cream cheese gives cauliflower mashed potatoes a richer, creamier texture.
Start with a tablespoon at a time so you don’t overpower the taste.
3. Cook It Down on the Stovetop
Another way to thicken up cauliflower mashed potatoes is to cook the excess moisture out.
Put the mashed cauliflower back in a saucepan over low heat.
Stir constantly for 5 to 10 minutes until the mixture thickens.
Just keep an eye on it so it doesn’t stick to the bottom of the pan.
4. Mix in a Starchy Helper
If you’re not strictly low-carb, a small amount of potato flakes or cornstarch can thicken cauliflower mashed potatoes quickly.
Add one tablespoon at a time and stir well before adding more.
A little goes a long way, so don’t dump in half the box.
5. Use a Nut-Based Binder
For a keto-friendly option, try adding a couple of tablespoons of almond flour or coconut flour.
Both absorb moisture and help thicken up cauliflower mashed potatoes without adding many carbs.
Coconut flour soaks up more liquid, so use it sparingly.
How to Prevent Watery Cauliflower Mashed Potatoes
Prevention is easier than fixing a runny batch, so keep these tips in mind.
1. Roast Instead of Boil
Roasting cauliflower in the oven evaporates moisture and deepens the flavor.
Toss florets in olive oil, spread them on a baking sheet, and roast at 400°F for about 25 minutes.
The result is drier cauliflower that mashes into a thicker, richer dish.
2. Let It Steam Dry
After cooking, spread the cauliflower on a baking sheet and let it sit for 10 minutes.
The residual heat pushes out steam, and the dry air helps evaporate surface moisture.
This simple step keeps your cauliflower mashed potatoes from turning watery.
3. Salt and Drain
Sprinkle salt on the cooked florets and let them sit in a colander for 15 minutes.
The salt draws out water through osmosis, and the colander lets it drain away.
Then pat dry before mashing.
So, How Do You Thicken Up Cauliflower Mashed Potatoes?
You thicken up cauliflower mashed potatoes by removing excess moisture first and then adding a thickening agent like Parmesan, cream cheese, or almond flour if needed.
The key is to start with dry cauliflower — roast or steam it rather than boil, drain it well, and mash instead of blend.
If your cauliflower mashed potatoes still turn out runny, strain them, cook them down, or stir in a binder until you reach the texture you want.
With these tricks, you’ll never have to settle for watery cauliflower mashed potatoes again.