Prepare jalapeno peppers by slicing into rounds.
In a saucepan, combine sugar, apple cider vinegar, garlic powder, and celery seed.
Bring the mixture to a boil, stirring until the sugar is dissolved.
Add the sliced jalapenos to the saucepan and simmer for 4 minutes.
Remove the jalapenos from the heat and let them cool in the syrup.
Store the candied jalapenos in jars with the syrup.
