Preheat the oven to 225 degrees F (107 degrees C). Line a baking sheet with parchment paper.
Bring a pot of water to a gentle boil. Remove from heat and add cranberries (do not boil them). Set aside for 10 minutes. They will soften and start to pop.
Drain the water from the cranberries as soon as they have popped. Transfer to a large bowl.
Add powdered Besti and avocado oil to the cranberries. Gently toss to coat. Be gentle to avoid smashing the berries.
Spread out the berries on the lined baking sheet. Use the tip of a knife or a toothpick to pop any berries that have not popped yet.
Place the baking sheet into the oven for 3-4 hours, until the cranberries are shriveled and mostly dry.
When done, they are ready to eat if you're in a hurry but will not be completely dry. For best results, turn off the oven and leave the cranberries in there. Prop the door open with a wooden spoon. Leave like this for several hours or overnight, until completely cool and dry.
