Mix together both sugars, melted butter, eggs and vanilla.
Sift dry ingredients together and add to first mixture.
Roll and refrigerate overnight.
Slice and place on cookie sheet.
Bake at 400 degrees until light brown.
Divide the batter in thirds and add red food coloring to one batch, blue food coloring to a second batch and leave the third batch white.
You'll have red, white and blue cookies.