Heat oven to 350°F.
Grease 12-cup Bundt pan with Pam/Flour
Beat sugar, butter and vanilla.
Add eggs one at a time.
Measure out 1 cup of this batter into another bowl set it aside.
To the main bowl, add pumpkin.
Add 1 3/4 cups flour, 1 teaspoon baking powder, salt and cinnamon.
Spoon half of this pumpkin batter into pan.
Add the melted chocolate to the 1 cup batter in the second bowl.
Add 1/2 cup flour and 1/2 teaspoon baking powder;.
Add buttermilk and combine well.
Drop chocolate batter all over pumpkin batter in pan.
Pour rest of batter carefully on top.
Use a chopstick or knife to swirl the pumpkin and chocolate batters together.
Bake approx 50 mins.
Cool in pan 10 minutes and flip out onto a rack to finish cooling.
