5 Brilliant Ways to Thicken Slow Cooker Soups, Stews & Sauces (2024)

Meghan Splawn

Meghan Splawn

Meghan was the Food Editor for Kitchn's Skills content. She's a master of everyday baking, family cooking, and harnessing good light. Meghan approaches food with an eye towards budgeting — both time and money — and having fun. Meghan has a baking and pastry degree, and spent the first 10 years of her career as part of Alton Brown's culinary team. She co-hosts a weekly podcast about food and family called Didn't I Just Feed You.

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updated Feb 28, 2024

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5 Brilliant Ways to Thicken Slow Cooker Soups, Stews & Sauces (1)

In This Article

  1. 1. Prop the lid up for evaporation.
  2. 2. Purée your soup or stew a little.
  3. 3. Add a slurry at the end.
  4. 4. Enrich with canned milk.
  5. 5. Add a little starch.

Cooler weather means soup season is officially here. And while we love slow cooker soups, stews, and saucy braises of all kinds, the slow cooker brings its own set of challenges when it comes to getting that creamy, comforting soup texture just right.

Slow cookers that heat as low and slow, as their name implies, rely on heat that’s captured by their lid being in place. That means there is no evaporation happening, like with stovetop soups. But we have a few smart tricks for thickening even the most finicky slow cooker soups.

1. Prop the lid up for evaporation.

This tip actually comes from our slow cooker fruit butter, but it also works really well for stews and braises — like chili and chicken tinga. While your dinner cooks, prop the lid open a bit so that moisture can escape and thicken the stew naturally without extending the cooking time too much. Skewers or chopsticks between the lid and the crock of the slow cooker work well for this.

2. Purée your soup or stew a little.

Have a vegetable soup that turned a little watery while cooking? All you need is a blender and a minute to purée. If you’ve got an immersion blender, you can stick it directly into the soup to purée. Otherwise, remove a cup or two of the soup, pour it in your blender, and carefully blend until smooth. Return the blended soup to the slow cooker and give it all a stir — and you’ll have thicker soup.

3. Add a slurry at the end.

A slurry is a mixture of flour and water, whisked together until smooth and added towards the end of cooking; it’s a super-simple way to thicken any soup. For slow cooker soups, add your slurry with at least 30 minutes of cook time left so that the raw flour can cook and thicken the soup. Need a gluten-free option? You can make a slurry from puréed white beans, too.

4. Enrich with canned milk.

Cream is one of the most delicious ways to thicken a soup — all that rich milk fat helps to emulsify the soup and make it even creamier. Cream can curdle with the long cook time of the slow cooker, so I prefer canned milks like evaporated milk or coconut milk for thickening instead.

5. Add a little starch.

Cornstarch, potato starch, and chickpea flour are a couple of pantry-friendly ways to thicken soups, stews, and sauces in the slow cooker. Just a tablespoon or two of any — added towards the end of cooking — will thicken sauces especially well. Just be sure to mix them with a little water before adding to the slow cooker to prevent clumping.

Do you have a favorite way to thicken slow cooker stews or sauces?

5 Brilliant Ways to Thicken Slow Cooker Soups, Stews & Sauces (2024)

FAQs

5 Brilliant Ways to Thicken Slow Cooker Soups, Stews & Sauces? ›

As a rule of thumb, dissolve 2 parts cold water and 1 part cornstarch. Add the slurry to your sauce as it simmers in the slow cooker. Cornstarch is always a good way to thicken a sauce or soup but personally I would recommend going a different route as the cornstarch slurry may change the flavor of the meal.

How to thicken stews in a slow cooker? ›

As a rule of thumb, dissolve 2 parts cold water and 1 part cornstarch. Add the slurry to your sauce as it simmers in the slow cooker. Cornstarch is always a good way to thicken a sauce or soup but personally I would recommend going a different route as the cornstarch slurry may change the flavor of the meal.

What is the secret ingredient to thicken soup? ›

Add Flour Or Cornstarch

You can thicken soup by adding flour, cornstarch, or another starchy substitute.

Is it better to thicken stew with flour or cornstarch? ›

Cornstarch has twice the thickening power of flour. When a gravy, sauce, soup or stew recipe calls for flour, use half as much cornstarch to thicken. To thicken hot liquids, first mix cornstarch with a little cold water until smooth. Gradually stir into hot liquid until blended.

Does taking the lid off a slow cooker thicken the sauce? ›

Take the lid off

Place the cooker on a high setting, and open the lid for 30-45 minutes to let excess moisture cook off. The liquid will reduce, leaving you with a thick and delicious gravy or sauce. (Tip: This trick can also be applied for thickening stews, or when you've accidentally added too much liquid.)

How to thicken sauce from a slow cooker? ›

Cornstarch, potato starch, and chickpea flour are a couple of pantry-friendly ways to thicken soups, stews, and sauces in the slow cooker. Just a tablespoon or two of any — added towards the end of cooking — will thicken sauces especially well.

What is the best thickener for beef stew? ›

The three main thickening agents for gravies are flour, cornflour and arrowroot. The first two are normally used in savoury dishes while arrowroot tends to be used in sweet dishes – that said, arrowroot will work in a savoury dish as it has no flavour.

How many tablespoons of cornstarch to thicken stew? ›

Use one tablespoon cornstarch mixed with one tablespoon cold water (aka a cornstarch slurry) for each cup of medium-thick sauce. Thoroughly mix the cornstarch and water together, then pour into your sauce. Cook and stir over medium heat until thickened and bubbly.

How do you thicken stew without flour taste? ›

My secret weapon. Instant mashed potatoes. Pour them on, stir them in, give it a minute or 2, and it'll be nice and thick.

How to thicken soup in a crockpot? ›

Make a slurry.

Just whisk together equal parts cornstarch and water to make a slurry — using about 1 tablespoon cornstarch per cup of liquid in your recipe — then whisk this into your pot. Cook until the sauce begins to thicken.

Why put foil under the lid of a slow cooker? ›

The heat bounces off from the lid and allows your food to cook faster. Also, you will not lose any of the steam that usually evaporates.

Is 4 hours on high the same as 8 hours on low? ›

Low: 7-8 hours to reach the simmer point. High: 3-4 hours to reach the simmer point.

Why is my stew in slow cooker still tough? ›

It's because you haven't let the collagen break down. Extend the cook time, make sure there's enough liquid and keep an eye on the dish.

How can I thicken my stew without flour? ›

A handful of uncooked rice. That's all folks, just a handful of white rice. Any kind will do: jasmine, basmati, short grain, long grain. When added to a brothy (or watery, even) soup, and left to simmer for 20-30 minutes, the rice breaks down, releasing its starch and thickening the liquid that it's cooking in.

When to add cornstarch to a slow cooker? ›

The easiest way to do this is to stir in a cornstarch slurry during the last hour of slow cooking time. You'll combine two tablespoons of cornstarch with two tablespoons of water in a small bowl and stir until smooth. Stir this mixture into the slow cooker when there is one hour of cook time left.

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