Preheat oven to 350F (175C). Spray a large cookie sheet
with cooking spray. In a large bowl, cream together the butter and brown
sugar. Add the cream. Add eggs and vanilla, and beat until smooth. In a medium bowl, combine flour, cream of tartar and salt. Add flour mixture to sugar mixture, and combine until dough forms. Roll dough out onto a floured surface, about 1/4 thick, adding more flour as needed to prevent sticking. Use a 3 inch diameter cookie cutter to cut dough, and place on prepared cookie sheet. Sprinkle lightly with granulated sugar. Bake
at 350F (175C) for 10 minutes or until a toothpick inserted into center of cookies comes out clean. Remove from oven and let cool for a few minutes before eating.
Original recipe makes about 17 cookies.