Ingredients
Equipment
Method
Prep and preheat
- Preheat oven to 350F. Grease a 9x5 loaf pan and set aside.
- Whisk flour, baking powder, baking soda, salt, cinnamon, and nutmeg together. Mix until evenly combined with no visible dry clumps.
Make the batter
- Whisk eggs, both sugars, oil, sour cream, and vanilla until smooth. Stop when the mixture looks glossy and uniform.
- Fold the flour mixture into the wet ingredients until just combined. Fold gently so the batter stays thick and does not overmix.
- Fold in the diced apples. The batter should be evenly dotted with apple pieces.
Add the cinnamon swirl and bake
- Pour half the batter into the prepared pan. Spread it into an even layer with a level top.
- Mix the cinnamon-sugar swirl and sprinkle half over the batter. Lightly scatter it so it forms a golden streak pattern.
- Add remaining batter on top and smooth the surface. Keep the top as even as possible for a clear swirl.
- Sprinkle remaining cinnamon sugar over the top. The crust should look speckled and lightly glossy.
- Run a knife through the batter once to create a subtle swirl. Make one controlled pass so the swirl remains gentle rather than mixed through.
- Bake 55-65 minutes at 350F until a toothpick inserted in the center comes out clean. The loaf should be golden on top with a set center.
Cool and slice
- Cool in the pan 15 minutes before slicing. This helps the interior firm up for neat, tender slices.
Notes
Pro tip: Finely dice the apples so they distribute evenly and bake through without pockets. Store this loaf wrapped at room temperature up to 2 days or refrigerated up to 5 days; freeze slices in an airtight bag up to 2 months for quick reheating. For a lighter texture, swap half the oil with unsweetened applesauce (use the same total amount of fat) while keeping the sour cream.
