Heat oven to 375 degrees F. Line muffin pan with paper liners and set aside.
Sift the flour, cocoa, baking powder, baking soda, salt, Saigon cinnamon, nutmeg, and cloves in a large bowl and set aside.
Combine the buttermilk, pumpkin, and vanilla in a medium bowl and set aside.
Beat the butter and sugar together in a large bowl using an electric mixer on medium speed, until fluffy. Incorporate the eggs, adding one at a time. Beating until the mixture is smooth and light.
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Alternately add the flour mixture and pumpkin mixture, blending well after each addition.
Fill cups 2/3 full with batter.
Bake for 18 minutes, until an inserted toothpick comes out clean. Let cool for 10 minutes in the pan and then remove to a wire rack to cool completely.