I like the recipe JoyMKen linked, so I decided to make caramel corn for my nephew's class. The first batch, I burnt the whole 4 quart of popcorn. :-( The recipe said to bake for 45 mins but after 30 mins., my popcorn burned. Afterwards, I based the smell and the color of the popcorn to gauge the baking time. Turns out I only need to bake for 20 mins and reduce the temperature to 200 degrees.
