01 -
Whisk together gluten-free all-purpose flour, baking powder, baking soda, salt, cinnamon, and nutmeg in a large bowl to ensure even distribution.
02 -
Using an electric mixer on medium speed, beat the softened butter and granulated sugar until pale and fluffy to incorporate air for a tender texture.
03 -
Beat in eggs one at a time, making sure each is fully incorporated before adding the next, then stir in the vanilla extract evenly.
04 -
Fold in sour cream gently with a spatula or mixer on low speed to maintain moisture and richness in the batter.
05 -
Gradually add the dry ingredients to the wet mixture, stirring gently until just combined to avoid toughening the batter.
06 -
Toss chopped apples with brown sugar and cinnamon until evenly coated to create sweet spiced pockets in the bread.
07 -
Pour half the batter into a greased or parchment-lined loaf pan, spread half the apple mixture over it, and lightly swirl with a knife. Repeat with remaining batter and apples, finishing with a swirl.
08 -
Allow the assembled batter to rest at room temperature for 10 minutes to hydrate the flours for a smoother crumb.
09 -
Bake at 350°F for 50-60 minutes until a toothpick inserted near the center comes out clean or with moist crumbs. Cool in the pan for 20 minutes before transferring to a rack to cool completely.