Step 1

Preheat oven to 350°F and line 2 baking sheets with parchment paper.

Step 2

Mix together flour, cornstarch, baking soda, and salt in a small bowl and set aside.

Step 3

In a large bowl or mixer, cream together butter and sugars until fluffy and lightened in color. 3-4 minutes.

Step 4

Beat in egg and vanilla extract, then scrape down sides and beat for another 1 minute.

Step 5

Gradually mix dry ingredients into the egg mixture and beat until just combined.

Step 6

Fold white chocolate chips and dried cranberries into the dough (it will be thick) and mix until incorporated. Note: if not making cookies immediately, freeze the dough at this stage.

Step 7

Using a small ice cream scoop or tablespoon, scoop even-sized dough balls and place them on baking sheets.

Step 8

Place in oven and bake for 8-10 minutes, or until just set. (They will continue to cook and firm up after you take them out of the oven.)

Step 9

Remove from oven and let cool 10 minutes, then transfer to a wire rack to cool completely.