Ingredients
Equipment
Method
Prep and crumb topping
- Preheat the oven to 350°F and grease a 9x5 loaf pan so it’s ready to fill. Keep the oven fully preheated before baking for even rise.
- Make the crumb by cutting cold unsalted butter into all-purpose flour, brown sugar, cinnamon, and nutmeg until large crumbs form. Refrigerate the crumb mixture to keep it from melting into a paste.
Mix the pumpkin batter
- Whisk the flour, baking soda, pumpkin pie spice, cinnamon, and salt until evenly combined. This ensures the spices are distributed through the loaf.
- Whisk the pumpkin, sugar, brown sugar, oil, eggs, vanilla, and sour cream until smooth. Stop when the mixture looks uniform with no streaks.
- Fold the wet mixture into the dry ingredients until just combined, then pour the batter into the prepared loaf pan. Do not overmix so the crumb stays tender.
Assemble and bake
- Scatter the crumb topping very generously over the entire top, covering every inch for full coverage. Press lightly only if needed so crumbs adhere.
- Bake for 60–65 minutes at 350°F until a toothpick comes out clean, tenting with foil after 35 minutes to protect the crumb. Check at the low end of the range to avoid overbaking.
Notes
Tip: keep the butter cold and chill the crumb so it bakes into a thick, crunchy streusel layer. Store the loaf covered at room temperature for up to 3 days or refrigerate up to 5 days; freeze wrapped slices up to 2 months. For a lighter swap, use light sour cream in the same amount and expect a slightly softer crumb.
