Toss cranberries in the liquid allulose until coated.
Spread monk fruit onto a plate. Add the cranberries and toss to coat evenly. Transfer the cranberries to a plate or wire rack and to allow them to dry. Keep space between the berries to prevent them from sticking to each other. After 20 minutes, roll in more monk fruit.
Store sugared cranberries in an airtight container, refrigerated for up to 3 days.