Put all the spice powders in a small container with a lid. Cover and give it a good shake to form a homogenous spice mixture.
Pressure cook the squash pieces without adding water for 2 whistles. Remove and let it cool completely. Blend to a very smooth puree.
Now in a large mixing bowl take the squash puree. Add the spice mixture and condensed milk and whisk together - again to form a homogenous mixture.
Next fold in the lite whipped cream (cool whip or any other equivalent). Mix gently until the whipped cream is fully incorporated in the squash mixture.
Transfer the above to a freezer friendly container and freeze for 6-8hours.
Voila! Your spiced squash ice cream is ready!. This can be served as it is for dessert - but serve it on warm squash halwa and you have a super heartwarming dessert. The spices from the ice cream are so much more enhanced when warmed up by the bed of warm squash halwa!