In a cocktail shaker combine ice, vodka, creme liqueur, half and half, pumpkin puree and pumpkin pie spice. Shake vigorously until chilled.
Use a napkin to wet the rim of a martini glass. Combine equal parts cinnamon and sugar on a plate. Roll the rim in the mixture.
Pour the martini in the prepared glass and sprinkle with more pumpkin pie spice if desired.
Simple as that. I suppose you could double, triple, or even quadruple this recipe pretty easily but you should share if you do that. Or at least make sure the majority of the cooking is done before you reach for the 4th one. Happy Thanksgiving everyone! Eat lots and enjoy the most important part of the holiday: loved ones.