Did you know that peppers are perennial? They'll grow back if they're "overwintered" aka "winterized."
But first, pepper plants can't survive frosts or freezing temperatures. Here's a summary of the overwintering process...
Pick off any remaining chillies, cut off the leaves and prune the branches down to its original "Y" stem.
Add a couple inches of moistened potting soil to the bottom of a pot. A size around 2-gallons works well.
After removing plants from their current pots, spray the roots with a hose to get rid of the dirt.
Mix a Neem oil solution, and then spray plants and roots down to kill existing pests.
Hold your plant about an inch from the top of the pot, then fill in the container with moistened potting soil.
Put your plants near a window or use a grow light for about 8 hours a day.