Pumpkin Tunnel Cake

Pumpkin tunnel cake is the bundt that hides its best trick inside. A spiced pumpkin filling layered into the middle of the batter bakes into a marbled ring through every slice, like the tunnel of fudge cakes from the 70s but made for fall.

The base cake itself is built smarter than most bundts. Egg whites in place of whole eggs and a half cup of bran folded into the flour cut the fat without losing tenderness, while buttermilk and brown sugar carry deep, almost butterscotch warmth.

The filling layer goes down only over the center of the batter, never touching the pan walls. That’s how you get a clean tunnel rather than the filling burning out the bottom or breaking through the surface during the bake.

A simple powdered sugar and pumpkin pie spice dust at the end is all the finish this cake needs.

Pro Tips

• Coat the bundt pan thoroughly with cooking spray, getting into every fluted curve. The brown sugar batter sticks aggressively without a clean coat.
• Spoon the pumpkin filling in a tight ring in the middle of the batter, not spread to the edges. Filling that touches the pan wall will leak and burn during the bake.
• Use cooked, mashed pumpkin (or canned pumpkin puree) that’s well drained. Wet pumpkin makes the tunnel filling sloppy and the cake won’t rise around it cleanly.
• Cool the cake exactly 10 minutes before unmolding, no longer. Sitting too long lets the bottom cool and stick.

Variations

• Stir ½ cup chopped pecans or walnuts into the pumpkin filling for crunch in the tunnel.
• Drizzle with a maple glaze instead of dusting with powdered sugar for more pronounced sweetness.
• Swap the bran for ground oats or wheat germ for a different fiber profile.