In a large bowl, combine the cranberries, orange or pineapple juice, and the can of Sprite. Make sure the cranberries are fully submerged. Cover the bowl and refrigerate for at least 12 hours, or overnight for maximum flavor.
After soaking, drain the cranberries thoroughly using a colander. Pat them gently with a paper towel to remove excess moisture, but don’t let them dry completely—the powdered sugar needs something to stick to.
Place the drained cranberries in a large resealable plastic bag or a bowl with a lid. Add 2–3 cups of powdered sugar, seal, and shake vigorously until all the cranberries are evenly coated.
Preheat your oven to 250°F (120°C). Spread the powdered sugar-coated cranberries in a single layer on a cookie sheet lined with parchment paper. Bake for 5–7 minutes to help set the sugar coating. Be careful not to overbake—they should be warm, not melted.
Allow the cranberries to cool completely before serving. Once cooled, they’ll have a delightful sugary crunch with a juicy, tangy center.