A lot of times when we think of using the slow cooker, it’s because we’re leaving the house early and won’t be back until dinner. Slow cookers are great for those days, but not all recipes will work.
You need to use a recipe that can take the heat for that long and still hold up. Soups, stews, large pieces of meat (especially if it has a bone) all do well.
Another tip is to make sure you’re using a slow cooker size that’s right for the amount of food. It should be about 3/4 full or more if you want to cook it all day. Less than that, and the slow cooker will cook too hot, leading to overcooked food.
Here’s a list of recipes that you’ll have success with.