Wash fresh blueberries and dry them with a towel.
Place the blueberries in boiling water for 30 to 60 seconds, then dip in very cold water. This "cracks" the waxy skin, to prepare the berries for drying.
Lay the berries on a tray and put in a 130 degrees Fahrenheit oven, with the oven door slightly open for air circulation.
Keep the berries in the oven for 10 to 20 hours until they are leathery, then take out.
Store dried blueberries in an airtight container in a cool, dry place. They can last up to a year.
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