Add softened butter to a large mixing bowl with the brown sugar. Mix with an electric hand mixer or paddle attachment of a stand mixer until light and fluffy.
Add the egg and vanilla extract to the bowl and mix again.
In a separate bowl combine all purpose flour, oats and baking soda. Mix together and pour dry ingredients into the bowl with the wet ingredients. Mix again with the mixer until evenly combined.
Fold dried cranberries and white chocolate chips into the batter with a flat spatula.
Cover dough and place in the fridge to chill for at least 1 hour.
Preheat oven to 350F and line 2 baking sheets with parchment paper.
Use a 2 tbsp cookie scoop to scoop dough balls onto lined baking sheets top with more cranberries and chocolate chips if desired. Leave space between each dough ball.
Bake at 350F for 13 -15 minutes. Cool on the sheet pan for a few minutes before transferring to a wire rack to cool completely.
** Bake from Frozen: roll into dough balls and freeze in balls. Bake directly from frozen at 325F for 17-18 minutes.