Pumpkin Cheesecake Pie/lowfat

• 1 gelatin
• 1 whip topping
• 475 gr pumpkin
• 240 gr gingersnap cookie
• 180 ml skim milk
• 170 gr brown sugar
• 230 ml cream cheese
• 45 gr butter
• 14 gr brown sugar
• 4 gr vanilla extract