With a mixer, beat the cream until it is thick - do not overwhip.
Add the pumpkin purée, sweetened condensed milk, vanilla, and spices and fold in until smooth.
Spoon half the mixture into a freezer-safe container and sprinkle with half the chopped pecans. Add the rest of the ice cream mixture and top with remaining pecans.
Freeze for 5-6 hours or overnight.
When ready to serve, remove the container from the freezer for 5-10 minutes to soften slightly.
Enjoy a scoop on its own in a bowl, in a cone, or on top of apple or pumpkin pie!