Cream butter. Gradually add sugar and cream well. Blend in the egg, cream, baking powder, baking soda, salt and vanilla. Gradually add flour and mix well. Chill dough until firm, several hours (it is hard to roll out otherwise). 2. Heat oven to 400 degrees. Roll out dough on a floured board to about 1/8- inch thick. Cut into desired shapes with a flour-dipped cookie cutter. Place on ungreased or lightly greased cookie sheet.