Muddle the fresh cranberries, rosemary sprigs and an orange slice (optional) in a cocktail shaker.
Add the unsweetened cranberry juice, fresh orange juice (optional), vodka and some ice cubes.
Pour in vanilla extract and sweetener only if you use Club Soda instead of Cream Soda.
Close the cocktail shaker with the lid and shake the contents quickly to infuse.
Add some ice, close the lid and shake it all up.
Strain the vodka cranberry mixture into a tumbler glass with ice cubes or one bug ice cube.
Top it up with cream soda, or add the club soda if you've added vanilla extract and sweetener.
Garnish with a slice of orange, cranberries and a rosemary sprig.