01 -
Whisk together flour, baking powder, baking soda, salt, cinnamon, and nutmeg in a medium bowl until evenly mixed.
02 -
Beat softened unsalted butter and granulated sugar with an electric mixer on medium-high speed until pale and fluffy, about 2 to 3 minutes.
03 -
Add eggs one at a time, beating well after each addition, then stir in vanilla extract. Scrape down the bowl as needed to ensure an even mixture.
04 -
Mix in sour cream until the batter is smooth, ensuring moisture and tenderness in the final loaf.
05 -
Gently fold dry ingredient mixture into the wet batter just until no flour streaks remain, avoiding overmixing to maintain a tender crumb.
06 -
Toss peeled, chopped apples with brown sugar and cinnamon in a small bowl until evenly coated.
07 -
Pour half of the batter into a greased loaf pan, spread half of the apple mixture over it, then top with remaining batter and apples. Use a butter knife to gently swirl apples into the batter for a marbled effect.
08 -
Bake in a preheated oven at 350°F (175°C) for 50 to 60 minutes, or until a toothpick inserted into the center comes out with a few moist crumbs.
09 -
Allow the bread to cool in the pan for 10 minutes before transferring it to a wire rack to cool completely.