Preheat the oven to 350°F (175°C) and line a cookie sheet with parchment paper, if desired.
In a large mixing bowl, cream together the softened butter, granulated sugar, and brown sugar until light and fluffy.
Add the eggs one at a time, mixing well after each addition. Stir in the vanilla extract.
In a separate bowl, whisk together the flour, baking soda, and salt.
Gradually add the dry ingredients to the wet mixture, mixing until well combined.
Gently fold in the dried cranberries and white chocolate chips (if using).
Drop tablespoon-sized scoops of dough onto the prepared cookie sheet, leaving space between each cookie.
Bake in the preheated oven for 10-12 minutes or until the edges are lightly golden.
Remove from the oven and let them cool on the cookie sheet for 5 minutes before transferring to a cooling rack to cool completely.
For a chewier cookie, do not overbake them; they should look slightly underbaked when you take them out.