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Using a slow cooker seems simple, and it is at least in theory.

Image of Beef beans spinach slow cooked stew on a textured countertop

OksanaKiian / Getty Images

Simply throw everything you need for your recipe into the appliance, turn on the heat, and wait.

A few hours later, youll find afully-cooked dinnerwaiting for you.

Thats damn easy, right?

Can you overcook something in a slow cooker?

When meat is overcooked, it will be tough and dry, while overcooked vegetables will be mushy.

Can you stop slow cooking and start again?

What cannot be cooked in a slow cooker?

As convenient as slow cookers are, they dont work for everything.

According to theUniversity of Minnesota, meat and poultry should be covered with liquid in a slow cooker.

Why is my beef tough when I make it in the slow cooker?

For cuts of meat, the fattier cuts are often the ones that get juicy and tender.

If you consistently notice tough beef, Carli says your slow cooker may not be working hard enough.

Try cooking for longer, or at a higher temp, she advises.

Is it safe to leave a slow cooker on overnight?

The short answer: Yes.

Keeping the slow-cooker on the high setting for that long may result in overcooked, dried-out food.

These are the top mistakes to avoid when youre slow cooking your meals.

If youre throwing raw meat straight into yourslow cooker, know that there are better ways.

Season with ateenybit of salt at the beginning, and do the heavy-duty salting at the finish.

Fresh herbstaste best, well, fresh.

That way, theyll add a nice, bright refreshing punch to your dish.

How much liquid goes in your slow cooker?

Again, double-check meat is fully covered in liquid, but otherwise keep it on the low side.

Slow cookers should be at least halfway, but no more than two-thirds full, write Vance and Lacalamita.

Food and Drug Administration advisesstarting with raw vegetables followed by meat or poultry.

More delicate items should cook towards the top of the appliance.

Peeking is tempting, but dont do it.

Wilmoth explains that slow cookers work by trapping heat.

Every time you remove the lid, the slow cooker loses heat, he tells SELF.

you’ve got the option to also use oil or butter.

Slow cooker liners ($6,Amazon).