Preheat oven to 350°F (180°C). Line a 9×5-inch (23×12 cm) loaf pan with parchment paper.
Mix wet ingredients in a large bowl: the zest from 1 medium lemon, ¼ cup lemon juice, 1 cup milk, ¾ cup sugar, ¼ cup olive oil, and 1 tablespoon vanilla extract.
Add dry ingredients: Sift in 2 cups all-purpose flour and 1 tablespoon baking powder, and 1 pinch of salt. Whisk gently until just combined.
Toss 1¾ cups blueberries with 1 tbsp flour, then fold into the batter. Pour into pan and smooth the top.
Bake for 50 minutes, or until a toothpick (avoiding blueberries) comes out clean. Cool in pan 15 minutes, then transfer to a wire rack.
Make glaze: Stir together 1 cup powdered sugar, 1 tablespoon milk, 1 tablespoon lemon juice. Drizzle over cooled cake. Slice and enjoy!
SUBSTITUTIONS
Lemon – Use zest + juice for max flavor; orange or lime works too.
Blueberries – Fresh is best; frozen okay if added unthawed.
Milk – Any milk works; soy and almond are our favorites.
Sugar – White, brown, or coconut sugar all work; add a pinch of salt.
Oil – Use neutral oil; sub butter (1.25x) or applesauce for oil-free.
Flour – All-purpose is ideal; try half whole wheat or a 1:1 GF blend.
Baking Powder – Must be fresh; no rise without it!
Vanilla – Optional; sub almond or maple extract if you like.
Lemon Glaze – Powdered sugar + lemon juice + milk + vanilla; sub orange or berry juice for a twist.
TIPS
Use the zest! – Lemon zest adds way more flavor than juice alone.
Flour the berries – Keeps them from sinking in the loaf.
Fresh is best – Use fresh blueberries if you can; frozen is fine unthawed.
Don’t over-mix – Mix just until combined for a soft, tender crumb.
Check your baking powder – Old = flat loaf. Make sure it’s fresh!
Cool before slicing – Helps the loaf set and slices stay clean.
Grab a serrated knife – It glides through without smashing the berries.
Glaze when cool – If the cake is warm, the lemon glaze will melt.
STORAGEStore the blueberry bread in an airtight container at room temperature for up to 3 days, or refrigerate for up to a week. Freeze sliced or whole for up to 3 months — just thaw at room temp or warm in the toaster oven.