Preheat your oven to 350°F (175°C).
In a large bowl, cream together the softened butter, brown sugar, and granulated sugar until smooth.
Beat in the egg and vanilla extract until well combined.
In another bowl, whisk together the flour, baking soda, and salt.
Gradually add the dry ingredients to the wet mixture, mixing until just combined.
Fold in the white chocolate chips and dried cranberries.
Drop tablespoon-sized portions of dough onto a baking sheet lined with parchment paper.
Bake for 10-12 minutes, or until the edges are golden and the centers are set.
Allow the cookies to cool on the baking sheet for 5 minutes before transferring to a wire rack.
Enjoy your freshly baked cookies!