Wash, peel, pit, and chop peaches
Add peaches, cinnamon, and vanilla to blender or food processor and blend until smooth
Pour into large pot over medium heat, stir in pectin, and bring to a boil
Add sugar, stirring constantly. Return to a boil. The mixture will bubble up to about twice its size. Boil for 1 minute and remove from heat
Skim off foam and discard
Add jam to warm jars, leaving 1/2 inch headspace
Clean rims, add warm lids and rings, and process in a water bath canner for 10 minutes
Remove from canner and place on a towel on the counter. Jars should not be touching. Allow to sit for 24 hours to seal. If the middle of the lid does not move when gently pressed, jams have sealed and are shelf stable.