A stunning fall dessert featuring swirls of warmly spiced pumpkin cake and rich chocolate batter, layered with nutty brown butter buttercream and topped with silky chocolate ganache.
4 oz semi-sweet chocolate chips
2 3/4 cups sifted cake flour
2 1/2 tsp baking powder
1 tsp baking soda
1 tsp salt
2 tsp ground cinnamon
1 tsp ground allspice
1 tsp ground nutmeg
1/2 tsp ground ginger
1 cup unsalted butter, room temperature
3/4 cup packed brown sugar
1 cup granulated sugar
3 large eggs, room temperature
2 tsp pure vanilla extract
1 1/2 cups canned pumpkin purée
1 cup full fat buttermilk
2 cups unsalted butter, room temperature, divided (for frosting)
7 cups powdered sugar
1/4 cup whole milk or heavy whipping cream
1/2 tsp salt (for frosting)
1/4 cup semi-sweet chocolate chips (for ganache)
1/4 cup heavy whipping cream (for ganache)