01 - Whisk together sourdough starter, lukewarm milk, eggs, melted butter, and vanilla extract in a large mixing bowl until smooth and well incorporated.
02 - In a separate medium bowl, sift together flour, sugar, salt, baking powder, and baking soda to ensure even distribution.
03 - Pour dry ingredients into wet mixture, stirring gently with a spatula until just combined. Avoid overmixing to prevent tough texture.
04 - Gently fold diced strawberries and white chocolate chips into batter until evenly distributed throughout.
05 - Cover bowl and let rest at room temperature for 3–4 hours, or refrigerate overnight, allowing flavors to develop through fermentation.
06 - Preheat oven to 350°F. Grease a 9x5-inch loaf pan thoroughly and line with parchment paper for easy removal.
07 - Stir rested batter gently, scrape into prepared loaf pan, and smooth top with spatula for even baking.
08 - Bake for 50–60 minutes until golden brown and a toothpick inserted in center comes out clean.
09 - Let cool in pan for 15 minutes, then transfer to wire rack to cool completely before slicing.