Heat oven to 300*F. Spray 9-inch spring form pan with cooking spray. Wrap foil apround pan to catch drips. In small bowl, mix crust ingredients. Press mixture in botton and 1 inch up side of pan. bake 8 to 10 minutes or untils set. Cool 5 minutes. To minimize cracking, place shallow pan half full of hot water o lower oven rack
In large bowl, beat creamcheese and granulated sugar with electric mixer on medium speed until light and fluffy, Beat in eggs, one at a time, just untill blended. spoon 3 cups of the mixture onto crust; spread evenly. To remainng cream cheese mixture, add pumpkin, pumpkin pie spice and cardamom, mix with wire whisk until smooth. spoon over mixture in pan.
Bake 1 hour 15 minutes to 1 hour 25 minutes or unti edge of cheesecake still jiggles sligtly when oved. Run small metal spatula around edge of pan to losen ceescake. Turn oven off: open oven door a eas 4 inchs. Let cheesecake remain in oven 30mnutes. Coolin pan on coolig rac 30 minutes. Coven loosely; refrigerate at least 6 hour but no longer that 24 hours.
In small saucepan, heat brown sugar, coorn syrup and 2 tbls. buter to boiling over medium-low hear, stirring constantly. Boil 5 minutes, stirring occasionally. Stir in whipping cream; heat to boiling. Remove from heat; stil in rum. Coll until warm.
Just before serving, run small metal spatula round edge of pan; carefully remove side of pan. To individual slices with warm sauce and a dollop of whipped cream. Cover and refrigerate any remaining cheesecake.