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["Preheat oven to 350u00b0F. Line a 9x13"" pan with aluminum foil and spray with cooking spray.", "Melt chocolate and butter in a heatproof bowl set over a double boiler or in the microwave. Set aside.", "Whisk together flour, baking powder, cayenne, and salt in a large bowl; set aside.", "Put sugar, eggs, and vanilla in the bowl of an electric mixer fitted with the paddle attachment; beat until well combined. Beat in flour mixture. Divide batter between 2 medium bowls (about 2 cups per bowl). Stir chocolate mixture into one bowl. In other bowl, stir in pumpkin, oil, cinnamon, and nutmeg.", "Transfer half of chocolate batter to prepared pan and smooth the top with a rubber spatula. Top with half of pumpkin batter. Repeat to make one more chocolate layer and one more pumpkin layer. Work quickly so batters don't set. With a small spatula or a table knife, gently swirl the two batters to create a marbled effect. My pan was a little bit smaller than a 9x13"
