Beat cream cheese and sugars in bowl with mixer on medium speed until smooth. Then beat in pumpkin, half and half, salt, pumpkin pie spice and vanilla until smooth and fluffy.
Lay enough chocolate graham crackers in a 9x9 pan to cover bottom. Cut to fit if necessary. Spread a quarter of the pumpkin mixture over crackers and smooth with an offset spatula. Layer 3 more times ending with pumpkin mixture.
Cover and chill overnight. Dust with cocoa powder before serving. Enjoy!