What Happens: Rice either gets mushy or stays crunchy despite extended cooking times.
Solution: Cook rice separately and combine it with the rest of the dish afterward. Instant rice works better in slow cookers but still requires careful timing.
8. Raw Beans
Dry beans, particularly kidney beans, require soaking and boiling before being safe to eat. Cooking them directly in a slow cooker poses a health risk because the low temperature fails to eliminate toxins naturally present in certain types of beans.
What Happens: Undercooked beans can cause food poisoning due to lectins, which are toxic compounds found in raw or improperly cooked beans.
Solution: Always soak and boil beans on the stovetop before adding them to the slow cooker. Canned beans are a safer alternative since they’re pre-cooked.
9. Delicate Vegetables
Vegetables like spinach, zucchini, and mushrooms release a lot of water and can become mushy or disintegrate in a slow cooker. Their texture suffers significantly after hours of simmering.
What Happens: Spinach wilts into nothingness, zucchini turns watery, and mushrooms lose their structure entirely.
Solution: Add delicate vegetables during the last 30–60 minutes of cooking to preserve their integrity.
10. Whole Eggs
Whole eggs cooked directly in a slow cooker often end up rubbery or unevenly cooked. Scrambled eggs or boiled eggs lack the precision needed for proper texture in a slow-cooking environment.
