In a large bowl or stand mixer, beat together the butter, brown sugar and white sugar until light and evenly combined. Mix in egg and vanilla until combined. Next mix in the flour, corn starch, baking soda and pinch of salt until a soft dough has formed.
Gently fold in cranberries and white chocolate chips.
Refrigerate cookie dough for minimum 1 hour up to overnight to get dough to correct consistency while baking.
Preheat oven to 350 degrees. Lightly spray cookie sheet with cooking spray. Roll dough into tablespoon size balls and place on cookie sheet
Bake apprx 8-10 minutes. Cookies may appear slightly undone but do not overbake. They will continue to set up once removed from oven.
Remove from oven and cool on baking sheets for another 10 minutes and carefully transfer to a baking rack to finsih cooling completly.
Enjoy!