Never Put This in a Slow Cooker

Low, slow heat can make for some truly droolworthy meals, but it's important to remember that not every food is slow cooker-friendly

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Close up of a slow cooker working on kitchen shelf
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Slow your roll

It sounds like a miracle meal machine: You dump in your ingredients, plug the thing in, and get a hot, hearty, perfectly cooked meal ready to eat—with next-to-no prep or cleanup time. With recipes for everything from breakfast to drinks (and dessert!), it’s easy to go a little slow cooker crazy. But alas, not every food is suited for slow cooking. Even Stephanie O’Dea, author of the New York Times best-selling Make it Fast, Cook it Slow cookbooks, who once used her slow cooker every day for an entire year, admits to having her share of flops. Here are 13 foods to avoid when using your slow cooker.

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Background of long rice close-up
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It seems like a no-brainer to toss rice and water in a slow cooker and let it do its thing. But the timing matters, says O’Dea. Rice can get overly starchy when it cooks too long, so it tastes gummy. One solution is to add instant rice—which has already been parboiled so it cooks quickly—to the pot when you have about 20 minutes of cooking time left. “This keeps the rice from disintegrating,” says O’Dea. Or use wild rice, which holds up nicely.

Here are 10 comforting slow cooker soup recipes you’ll want to try.

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Image in close-up of raw penne pasta.
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“If you don’t follow a recipe for pasta that is written specifically for a slow cooker and take note of the timing, it loses shape and becomes wallpaper paste,” says O’Dea. Like rice, pasta is best stirred in at the very end or baked in something like a lasagna. “My best suggestion when slow cooking is to begin with a few tried and true recipes from a trusted source,” she says, “and then after you have your own machine figured out, you can experiment.”

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Background texture of fried bacon strips.
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Maybe it goes without saying that you can’t get crispy foods out of a slow cooker, but plenty of people make bacon in the oven. “I tried, once, miserably, to make bacon-wrapped scallops because I was having a craving,” O’Dea says. “It turned into a stinky, gray, slimy mess and needed to be double-bagged in the outdoor garbage can.” If that tale doesn’t convince you, nothing will.

Here are more mistakes to avoid when cooking bacon.

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“You can’t cook eggs overnight and wake up to hardboiled eggs,” says O’Dea. She knows—she’s tried (and flopped).

Here’s the secret to perfect hard-boiled eggs, every time.

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fresh clams
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Even without the bacon, those scallops probably weren’t destined for greatness. Seafood is best when it’s not overcooked, and most slow cooker recipes take hours. Is it possible? Sure. But there are other, better ways to cook fish and shellfish. Use them.

Find out the healthiest fish you can eat.

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White Milk Texture with bubbles
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Milk and milk products tend to curdle at warm temps, which is a chemical reaction that causes dairy proteins to stick together, making the liquid lumpy. It isn’t always a sign that the milk’s gone bad, but it can be. In fact, says O’Dea, curdling milk is part of the recipe for making yogurt. If that’s not what you’re going for, it’s best to add dairy at the end of the cooking cycle, or use an alternative method for especially dairy-rich recipes.

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Frozen beef pieces with hoarfrost texture closeup
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Frozen food

Slow cooking means low cooking—your temperature won’t get much above 300 degrees, even on the high setting. So you don’t want to toss food that hasn’t been completely thawed in there, because it can further lower the temperature inside the pot and throw off your whole cooking time. “My rule of thumb is to not place a huge block of anything frozen in a slow cooker,” says O’Dea.

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red kidney bean
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Since dried beans need to soak overnight before cooking anyway, a slow cooker sounds like a great solution. The only problem is that some beans, including kidney, contain a natural toxin that is normally wiped out by boiling. Slow cookers rarely reach the temperature necessarily to destroy that toxin (212 ºF). You should always soak, rinse, and boil beans for at least 10 minutes before you add them to a slow cooker.

Don’t miss this roundup of our 50 all-time favourite slow cooker recipes.

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Chicken breast fillet background.Fresh Boneless and Skinless Chicken Breast Fillets.
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Skinless boneless chicken breast

White meat, especially without skin or bones, will dry out when cooked as long as most slow cooker recipes. That’s because it’s so lean, it lacks the natural fat that helps cook other meats. Breasts will do better in saucy recipes, says Ashley Sauvé, a certified holistic nutritionist.

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Green veggies

“Non-starchy green veggies like kale, spinach, and broccoli are super nutritious additions to any meal, but if you throw them into a slow cooker for too long, they’ll get mushy,” says Sauvé. Overcooking can also zap some of the nutrients found in these foods, so add them during the last few minutes of cooking.

Looking for small-batch meals? Check out these slow cooker recipes for two.

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close view on fresh herbs bunch
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Fresh herbs

“Fresh herbs should never be cooked in a slow cooker,” says Sauvé. Things like basil, sage, and oregano will lose all their flavour and turn an unappetizing brown colour when cooked that long. Either add fresh herbs at the end of the cooking period or use dried herbs, which better stand up to long cooking times.

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Israeli Couscous Mix
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Like rice and pasta, this grain will absorb way too much liquid and end up turning to mush if you try slow cooking it, says Sauvé. “If you want a side of grains with your meal, it’s better to cook them up separately on the stove before you sit down to eat.”

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Line of wine bottles. Close-up.
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When you cook with wine or spirits on the stove, the alcohol burns off. But low, slow heat can’t do that, especially if you’re adding the alcohol at the end of the cooking cycle, which means your dish might taste boozy. Whether that’s a fail or not is up to you.

Check out more slow cooker mistakes everyone makes.

Reader's Digest
Originally Published on Reader's Digest