Prep Jars. Start by sterilizing or heating the jars and lids according to the manufacturer's instructions. Keep the jars hot until ready to fill.
Combine Ingredients. In a large pot, combine the chopped peppers, apple cider vinegar, and pectin. Stirring frequently, bring the mixture to a boil over high heat.
Add Sugar. Once boiling, add the sugar all at once. Return the mixture to a full rolling boil, one that cannot be stirred down, and boil for 1 minute, stirring constantly.
Fill Jars. Using a ladle and canning funnel, carefully fill the hot jars with the jelly, ensuring even distribution of the pepper pieces and leaving a ¼-inch headspace. Wipe the rims and threads of the jars clean, place the lids on the jars, and screw the bands on until fingertip-tight.
Process. Place the filled jars in the waterbath canner, making sure they are completely submerged under water. Bring to a boil and process for 10 minutes (adjust time for altitude if necessary).
Cool. Remove the jars from the canner and set them on a towel or cooling rack. Allow the jars to cool for 24 hours. Check the seals, label the jars, and store them in a cool, dark place.