Preheat your oven to 350°F (175°C). Grease and flour a 9x5 inch loaf pan.

In a mixing bowl, combine pumpkin puree, applesauce, maple syrup, and vanilla extract. Whisk until smooth.

In another bowl, mix together flour, baking powder, baking soda, salt, cinnamon, nutmeg, and cocoa powder.

Gradually add the dry ingredients to the wet ingredients, stirring until just combined.

Divide the batter in half. To one half, add the cocoa powder and mix well. Alternate spooning the pumpkin and chocolate batters into the prepared pan, then swirl with a knife to create a marble effect.

Bake in the preheated oven for 45-50 minutes, or until a toothpick inserted into the center comes out clean.

Allow the cake to cool in the pan for 10 minutes, then transfer to a wire rack to cool completely before slicing.