Preheat oven to 275 F. Place sugars in food processor and process until very fine. Add butter and pulse until sugar is fully incorporated. Add flour and pulse until flour is incorporated. Place in plastic bag and press together to form dough, knead lightly until dough holds together. Remove from bag. Shape into 1-inch balls. Place on ungreased cookie sheets 2-inches apart. Flatten each with a cookie press or fork that has been lightly moistened with water. Bake 45 minutes to an hour or until pale golden. Remove from cookie sheets and cool completely on wire racks. Makes about 48
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