Step 4

Spoon half the pumpkin batter into a buttered and floured 12-cup bundt-cake pan. Drop half the chocolate batter by spoonfuls over (but not entirely covering) the pumpkin batter. Repeat to spoon remaining pumpkin and chocolate batters into pan. Gently run the blade of a butter knife around the center of the pan several times, then draw the knife across the width of the pan in 10 to 12 places to swirl batters.