In a medium non stick pot add sugar and corn syrup, butter and 1/2 cup cream.  Cook stirring (whisking) continuously until syrup has dissolved and boils. Slowly add remaining 1/2 cup cream, mixing continuously and continue on a slow boil,over low heat until mixture reaches 248° F (this takes a while so don't be impatient). Remove from heat add vanilla and stir to combine.  Immediately pour into a greased (buttered) baking pan 8x6 inches (21x16 centimeters).  Let cool and then cut into squares (or you can let it get hard and just break into pieces). Enjoy!Dip pieces in melted chocolate or wrap in waxed paper.