0.33cupunsweetened cocoa powdernatural or Dutch-process
0.5cupsemi-sweet chocolate chipsoptional but delicious
1tbspmilkoptional, to loosen chocolate batter if needed
0.25tspground cinnamonoptional boost of spice
Instructions
Preparation Steps
Preheat oven to 350°F. Grease a 9x5-inch loaf pan and line with a parchment sling for easy removal.
In a large bowl, whisk flour, baking soda, baking powder, salt, pumpkin pie spice, and cinnamon until evenly combined.
In a separate bowl, whisk eggs, granulated sugar, brown sugar, pumpkin puree, vegetable oil, vanilla, and milk until smooth.
Pour the wet mixture into the dry ingredients and gently fold with a spatula until just combined. Do not overmix.
Divide the batter evenly into two bowls. To one bowl, add cocoa powder and stir until smooth. If the chocolate batter seems thicker, stir in up to 1 tbsp additional milk to match consistency.
Fold chocolate chips into the chocolate batter.
Spoon alternating scoops of pumpkin batter and chocolate batter into the prepared pan. Use a butter knife to gently swirl the batters 3 to 4 times to create a marble effect (avoid over-swirling).
Bake for 50 to 60 minutes, or until a toothpick inserted near the center comes out with a few moist crumbs (no wet batter).
Cool in the pan for 10 minutes, then lift out using the parchment and transfer to a wire rack. Cool completely before slicing for clean marbling.
Notes
For bakery-style tops, sprinkle 1 tbsp coarse sugar over the batter before baking. Store airtight at room temperature for 2 days or refrigerate up to 5 days. Freezes well for up to 2 months.