This pumpkin marble cake is perfect for fall. To make this cake, you will need all-purpose flour, baking powder, salt, unsalted butter, granulated sugar, eggs, vanilla extract, milk, pumpkin puree, and pumpkin pie spice. The cake batter is divided into two parts, and one part is mixed with pumpkin puree and pumpkin pie spice to create the pumpkin batter. The two batters are then swirled together to create the marble effect. This cake is moist, tender, and has a beautiful swirl pattern. It's perfect for any fall gathering.