Ingredients
Equipment
Method
Prep the pan and heat oven
- Preheat the oven to 350F and brush a 9x5 loaf pan with melted butter, then coat with a generous layer of cinnamon sugar.
- Place the filled loaf pan on a sheet pan to catch any drips and keep baking stable.
Mix dry and wet ingredients
- Whisk together the flour, baking soda, pumpkin pie spice, cinnamon, and salt until evenly combined, with no visible spice streaks.
- Whisk together the pumpkin, sugar, brown sugar, oil, eggs, vanilla, and buttermilk until smooth.
Combine and build the swirl
- Fold the wet ingredients into the dry ingredients until just combined, keeping the batter thick and lump-free.
- Pour half the batter into the prepared pan, sprinkle a layer of cinnamon sugar, then add the remaining batter.
- Swirl gently with a knife to create cinnamon-sugar streaks through the batter.
- Top generously with the remaining cinnamon sugar so it forms a crust while baking.
Bake and cool
- Bake for 60-65 minutes at 350F until the cinnamon sugar forms a caramelized crust and a toothpick near the center comes out mostly clean.
- Remove the loaf from the pan while still slightly warm to prevent sticking, then slice after it cools slightly for clean pieces.
Notes
Pro tip: for the clearest cinnamon swirl, don’t over-mix after adding the wet to the dry—fold just until combined, then swirl lightly on top. Store tightly wrapped at room temperature for up to 3 days or refrigerate up to 7 days; freeze up to 2 months. For a dairy-light option, use a dairy-free buttermilk substitute (or mix unsweetened non-dairy milk with a little vinegar) to keep the same tender crumb.
