I made caramel corn and it came out grainy & chewy. How do I fix it?
Splitting your problem down to the two issues. Though they could be entirely related
1: Grainy 2: Chewy
Let's deal with the first - grainy. How are you melting your sugar (I am assuming you are using brown), are you adding corn syrup? Perhaps you have some granules of sugar that are 'un-melted'. It could be that your corn syrup (if used) is reacting in some way.
Now to the second - chewy. Try heating your sugar syrup for a little longer.
I hope that this helps. Below is a great recipe which might help.