In a small bowl, combine biscoff cookie crumbs and melted butter. Mix to combine.
Portion the crumbs into 28 2-ounce plastic cups using a small cookie scoop or spoon. Use one of the plastic cups to press the crumbs into the bottom of the cup. In another mixing bowl, combine room temperature cream cheese, granulated sugar, vanilla extract, pumpkin puree and pumpkin pie spice. Cream together on medium speed until combined and smooth.
Pour in heavy cream and mix on low speed until combined with the cream cheese mixture.
Whip on medium-high speed until light and fluffy.
Fill a piping bag with the pumpkin spice cream and pipe the cream into the cups on the crust until about 3/4 full.
(Optional but recommended) Add a small dollop of whipped cream and additional crushed biscoff cookie crumbs if desired.
Seal the cups with a lid and chill. The cups can be served immediately or stored in the refrigerator for 2-3 days.