Heat oven to 325°F. In large bowl, combine butter and 3/4 cup powdered sugar; beat until light and fluffy. Lightly spoon flour into measuring cup; level off. Stir in flour, 1/2 cup finely chopped cashews and ginger; mix well. Press dough evenly into ungreased 15x10x1-inch baking pan. Sprinklewith coarsely chopped cashews; press lightly into dough.