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Preheat the oven to 350 degrees F and grease your loaf pan or line it with parchment paper for easy removal.
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In a mixing bowl, combine the sugar and lemon zest. Use your fingertips to gently rub the zest into the sugar until it feels slightly damp and smells fragrant—this helps release the oils and brings out the best lemon flavor.
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Next, add the sourdough discard, eggs, Greek yogurt, oil, milk, and vanilla extract and whisk until combined.
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Toss the blueberries in 1 tablespoon of flour and set aside.
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In a separate bowl mix together the flour, baking powder, and salt.
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Fold the dry ingredients into the wet until just combined and then fold in the blueberries. Avoid over-mixing to prevent a tough, dry bread.
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Pour the batter into the loaf pan and set aside to make the crumble.
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How to make the crumble: mix the melted cooled butter, sugar, & flour until crumbly. If it is too wet, add a little more flour. The crumble can be chilled until ready to use as well.
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Sprinkle the crumble over the batter and bake for 50-60 minutes or until a toothpick inserted comes out clean or with just a few crumbs. Tent with foil halfway through if browning to quickly.
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Optional: Whisk together powdered sugar and lemon juice to make a simple glaze, then drizzle it over the blueberry lemon sourdough bread for a sweet finishing touch. Slice and enjoy!
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Storage: Store the blueberry lemon sourdough bread in an airtight container at room temperature for up to 2 days, or in the refrigerator for up to 5 days. For longer storage, wrap tightly and freeze for up to 2 months.