01 -
Whisk together gluten-free flour, baking powder, baking soda, salt, cinnamon, and nutmeg in a large bowl until evenly distributed.
02 -
Using an electric mixer, beat softened butter and granulated sugar on medium speed until pale and fluffy, incorporating air for tender texture.
03 -
Add eggs one at a time to the butter mixture, fully blending each before adding the next, then stir in vanilla extract.
04 -
Fold in sour cream gently using a spatula or mixer on low speed to maintain moistness and richness.
05 -
Gradually add dry ingredients to wet ingredients, mixing gently until just combined to avoid toughness.
06 -
Toss chopped apples with brown sugar and cinnamon in a small bowl for a sweet, spiced filling.
07 -
Pour half the batter into a greased or lined loaf pan, spread half the apple mixture evenly atop, then gently swirl with a knife. Repeat layering and swirling with remaining batter and apples.
08 -
Let the assembled batter rest at room temperature for 10 minutes to hydrate the flours and improve crumb.
09 -
Bake at 350°F (177°C) for 50 to 60 minutes until a toothpick inserted in the center comes out clean or with moist crumbs.
10 -
Cool in the pan for 20 minutes before transferring to a rack to cool completely, allowing structure to set.