Preheat oven to 350°F. Butter a 9x5-inch loaf pan thoroughly.
Cream butter and sugar with an electric mixer until light and fluffy, about 3 minutes. Beat in eggs one at a time until well combined.
In a separate bowl, whisk together flour blend, baking soda, and salt. Add to butter mixture and mix just until combined. (Don't overmix once you add the flour — gluten-free batters can get gummy.)
Fold in mashed bananas, sour cream, and vanilla until just incorporated.
Stir in walnuts and pour batter into prepared pan. Smooth the top gently.
Bake for 55-65 minutes, until a toothpick inserted in center comes out with just a few moist crumbs.
Cool in pan for 10 minutes, then turn out onto a wire rack to cool completely.
I use King Arthur Gluten-Free Flour for this — it has xanthan gum already in it, which helps with structure. If your blend doesn't have xanthan, add 1 teaspoon.
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