For the cake:
2 cups granulated sugar
1.5 cups all-purpose flour
3/4 cup Dark cocoa powder (such as Hershey’s Special Dark)
1.5 tsp baking powder
1.5 tsp baking soda
½ tsp salt
3/4 cup sour cream
¼ cup buttercream
1/2 cup canola or vegetable oil
2 large eggs
1 TBSP pure vanilla extract
1 cup boiling hot coffeeÂ
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 For the pumpkin buttercream:
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1 cup pumpkin pie filling (the canned stuff)
1 tsp ground cinnamon
1 cup unsalted butter, at room temp
2 tsp pure vanilla extract
4 cups powdered sugar
The remaining pumpkin mixture (what you don’t use in the frosting) will keep in the fridge for up to a couple of weeks, covered. It’s wonderful on toast, waffles, and pancakes and also in  cocktails …Â