Make the Cookie Dough: Beat softened butter in a large mixing bowl with an electric mixer, until well creamed, 1 minute or so. Add brown sugar and mix on high speed until well creamed with the butter, about 1 minute. Add the vanilla and egg and mix until just combined, on medium high speed. Add the flour and salt and mix until just combined. Mix in the chopped white chocolate and cranberries last.
1/2 cup + 5 tbsp salted butter, softened, 3/4 cup light brown sugar, packed, 1 large egg, at room temperature , 2 tsp vanilla extract, 2 cups all-purpose flour, spooned & leveled or weighed out , pinch salt, 5 ounces white chocolate, chopped, 3/4 cup sweetened dried cranberries, roughly chopped