Preheat your oven to 350 degrees Fahrenheit. Line a cookie sheet with a baking mat, or parchment paper or grease your pan if you prefer.
In a large bowl, beat the white sugar, brown sugar, and butter together. I like to use an electric hand-held mixer for this part.
Add in the egg and vanilla and mix until fully combined.
Add the flour, baking soda, and salt to the wet ingredients and mix together until all the ingredients are completely combined. You want to avoid overmixing.
Pour in the white chocolate chips and dried cranberries and fold them into the cookie dough.
Using a cookie scoop (standard-sized like this one,( or rolling into balls with about 2 tbsp of the cookie dough, place the cookies evenly on your greased or lined cookie sheets.
Bake for about 8-10 minutes. You want the edges to brown but the center will almost look slightly underdone.