Blueberry Lemon Loaf
A tender, moist quick bread with bright lemon flavor and pockets of fresh blueberries. The sour cream keeps it soft for days, while a simple lemon glaze adds tang and shine. Perfect for breakfast, brunch, or an afternoon snack.
- Prep
- 15 min
- Cook
- 50 min
- Wait
- 20 min
- Total
- 1 hr 25 min
- Makes
- 1 loaf (10–12 slices)
Steps
Before you start
- Preheat oven to 350°F (175°C) and position a rack in the middle.
- Grease a 9×5-inch (23×13 cm) loaf pan and line the bottom with parchment paper for easy release.
- Zest the lemon before juicing it; you'll need both zest and juice.
- Have all ingredients at room temperature, especially eggs and sour cream.
Mix dry ingredients
- In a medium bowl, whisk together 1¾ cups (220 g) flour, 1½ tsp (7.5 g) baking powder, and ¼ tsp (1.5 g) salt.
- Set aside.
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Ready when: Ingredients are evenly combined
Tip: Whisk by hand rather than sifting; it prevents overworking the flour.
Cream butter and sugar
- In a large bowl, beat together ½ cup (115 g) softened butter and 1¼ cups (250 g) sugar for 2–3 minutes, using a wooden spoon or electric mixer on medium speed.
- The mixture should look pale and fluffy.
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Ready when: Mixture is pale, fluffy, and increased in volume
Tip: This step incorporates air, which helps the loaf rise evenly. Room-temperature butter creams best.
Add eggs and vanilla
- Add 2 large eggs one at a time to the butter mixture, beating well after each addition until incorporated.
- Stir in 1 tsp (5 ml) vanilla extract.
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Ready when: Each egg is fully combined; mixture looks smooth and creamy
Tip: Adding eggs slowly prevents the batter from curdling. If it looks slightly broken, the sour cream will fix it.
Add lemon zest and juice
- Stir in the zest from 2 lemons (about 2 tablespoons) and 2 tablespoons lemon juice from those same lemons.
- Mix until evenly distributed.
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Ready when: Yellow zest is visible throughout the batter
Tip: Fresh lemon juice adds brightness; bottled juice will taste flat. Reserve any remaining juice for the glaze.
Alternate dry and wet ingredients
- Add half the flour mixture (about ¾ cup / 110 g) to the batter and stir gently until just combined.
- Add ¾ cup (180 ml) sour cream and mix until just combined.
- Add the remaining flour mixture and stir until no dry streaks remain.
- Do not overmix.
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Ready when: No white flour streaks visible; batter is smooth and thick
Tip: Overmixing develops gluten and makes the loaf tough. Mix only until no dry flour is visible.
Coat and fold in blueberries
- In a small bowl, toss 1½ cups (180 g) blueberries (fresh or frozen—do not thaw if frozen) with 1 tablespoon cornstarch.
- This prevents them from sinking and bleeding color.
- Gently fold the blueberries into the batter with a spatula, using as few strokes as possible.
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Ready when: Blueberries are evenly distributed throughout the batter
Tip: Coating blueberries in cornstarch keeps them from sinking to the bottom and prevents the batter from turning blue.
Pour and bakeOven 350°F / 175°C
- Pour the batter into the prepared 9×5-inch loaf pan and smooth the top.
- Bake at 350°F (175°C) for 50–55 minutes, or until a toothpick inserted near the center comes out clean or with just a few moist crumbs.
- The top should be light golden brown and a slight crack may form down the center.
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Ready when: Toothpick comes out clean or with a few moist crumbs; top is light golden and may crack slightly
Tip: If the top browns too quickly, loosely tent with foil after 35 minutes. Every oven varies, so start checking at 48 minutes.
Cool in pan
- Remove the loaf from the oven and let it cool in the pan for 10 minutes.
- Run a thin knife around the edges to loosen it, then turn it out onto a wire rack to cool completely, about 30 minutes, before glazing.
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Ready when: Loaf is cool to the touch and firm enough to handle
Tip: Cooling in the pan allows it to set without cracking. Turning it out too soon may cause it to break.
Make lemon glaze
- While the loaf cools, whisk together 1 cup (120 g) powdered sugar, 2 tablespoons fresh lemon juice, and 1 tablespoon milk in a small bowl.
- If the glaze is too thick, add a few drops more milk; if too thin, add a bit more powdered sugar.
- The glaze should be pourable but thick enough to coat the back of a spoon.
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Ready when: Glaze is smooth, pourable, and coats the back of a spoon
Tip: Adjust consistency gradually; it's easier to add liquid than take it away. The glaze will thicken slightly as it sits.
Glaze and set
- Once the loaf is completely cool, place it on a wire rack over a baking sheet or plate to catch drips.
- Pour or drizzle the glaze over the top and sides, allowing it to run down naturally.
- Let the glaze set for 10–15 minutes at room temperature before slicing.
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Ready when: Glaze is no longer wet to the touch and has a matte finish
Tip: A wire rack lets excess glaze drip off cleanly. If glaze sets too fast, warm it gently for 5 seconds.
Good to know
Tips
- Frozen blueberries work beautifully and often have better flavor than out-of-season fresh ones. Do not thaw them; the cornstarch coating will keep them from bleeding. They may add a few minutes to the baking time.
- For a more pronounced lemon flavor, add ¼ teaspoon lemon extract along with the vanilla, or replace one lemon with two times the zest and juice.
- The loaf stays moist for days thanks to the sour cream. Wrap individual slices in plastic wrap for easy grab-and-go breakfasts.
- If you don't have a loaf pan, use a 9-inch round cake pan or an 8×8-inch square pan; reduce baking time by 5–10 minutes and check for doneness earlier.
Make ahead
Bake the loaf up to 2 days ahead. Store it unfrosted and unglazed. Make the glaze up to 4 hours before serving and keep it at room temperature in a covered bowl.
Storage & reheating
Room temperature: in an airtight container or wrapped in plastic wrap for up to 3 days. Refrigerator: up to 5 days in an airtight container. Freezer: wrap the unfrosted loaf tightly in plastic wrap and foil; freeze for up to 3 months. Thaw at room temperature for 2–3 hours before glazing and serving. Do not freeze the glazed loaf, as the glaze becomes sticky when thawed.
Substitutions
- fresh or frozen blueberries (do not thaw if frozen) → Fresh raspberries, blackberries, or a mix of berries. Use the same weight (180 g) and coat with cornstarch the same way. Raspberries are more delicate; fold them in extra gently.
- full-fat sour cream, at room temperature → Greek yogurt (full-fat, plain) or crème fraîche. Use the same volume (¾ cup / 180 ml). Greek yogurt may make the loaf slightly denser but keeps it moist.
- fresh lemon → Fresh lime or orange zest. Use the same amount (about 2 tablespoons zest). Adjust juice by 1 tablespoon to match the citrus flavor.
- powdered sugar → Cream cheese glaze (4 oz softened cream cheese + 1 cup powdered sugar + 1 tbsp lemon juice). Tangy and rich; omit the milk and whisk cream cheese until smooth before adding sugar. It sets thicker than lemon glaze.
