Costco Lemon Blueberry Loaf Recipe

This Costco Lemon Blueberry Loaf is a tender and zesty recipe, which is loaded with fresh blueberries and topped with a sweet crumble and lemon icing. It’s the perfect treat for breakfast or dessert, ready in about 2 hours and 5 minutes.

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Costco Lemon Blueberry Loaf Recipe Ingredients

For the Crumble:

• 2 tbsp unsalted butter, melted
• 3 tbsp granulated sugar
• 1/3 cup (43g) all purpose flour
• Tiny pinch of kosher salt

For the Lemon Blueberry Loaf:

• 1 cup (200g) granulated sugar
• 2 tbsp fresh lemon zest (about 2 lemons)
• 1 1/2 cups (195g) all purpose flour, plus 1 tbsp for blueberries
• 1 tsp baking powder
• 1/4 tsp kosher salt
• 3/4 cup (185g) unsalted butter, room temp
• 1 tsp vanilla extract
• 3 large eggs, room temp
• 2 tbsp fresh lemon juice (about 1 lemon)
• 1/4 cup (60g) milk, room temp
• 1 1/2 cups (215g) fresh blueberries, plus a handful for topping

For the Lemon Icing:

• 1/2 cup (55g) powdered sugar
• 1/2 tbsp milk or cream
• 1/2 tbsp fresh lemon juice

How To Make Costco Lemon Blueberry Loaf

1. Make the Crumble and Prep: In a small bowl, mix together the melted butter, sugar, flour, and salt for the crumble. Place it in the refrigerator to chill while you make the batter. Preheat the oven to 350°F and grease and line an 8.5×4.5-inch loaf pan with parchment paper.
2. Combine Dry Ingredients: In the bowl of a stand mixer, add the sugar and lemon zest. Use your fingers to rub them together to release the lemon oils. Add the flour, baking powder, and salt, and mix to combine.
3. Add Butter and Wet Ingredients: With the mixer on low speed, add the softened butter one tablespoon at a time until the mixture is crumbly. Scrape down the bowl, then mix in the vanilla, followed by the eggs one at a time. Mix in the lemon juice, followed by the milk.
4. Add Blueberries: In a separate bowl, toss the fresh blueberries with 1 tablespoon of flour. Gently fold the coated blueberries into the batter.
5. Assemble and Bake: Pour the batter into the prepared loaf pan and spread it evenly. Top with a handful of extra berries, then sprinkle the chilled crumble mixture over the top. Bake for 50 minutes to 1 hour, or until a toothpick inserted into the center comes out clean with a few moist crumbs.
6. Cool and Glaze: Let the loaf cool in the pan for about 45 minutes. While it cools, whisk together the powdered sugar, milk, and lemon juice for the icing. Lift the cooled loaf out of the pan and drizzle with the icing before slicing.

Recipe Tips

• How do I get the most lemon flavor? The secret is to rub the lemon zest into the granulated sugar with your fingertips before you start mixing the batter. This releases the natural oils from the zest and infuses the entire loaf with a bright, intense lemon flavor.
• How do I prevent the blueberries from sinking? Tossing the fresh blueberries in a tablespoon of flour before adding them to the batter is a crucial step. The light flour coating helps the berries “grip” the batter, preventing them from all sinking to the bottom of the loaf pan during baking.
• Why use room temperature ingredients? Using room temperature butter, eggs, and milk is essential for a smooth, well-emulsified batter. This creates a more tender and evenly baked cake crumb.
• How do I know when the loaf is perfectly baked? The loaf is ready when a toothpick or skewer inserted into the thickest part of the center comes out clean or with just a few moist crumbs attached. The top should be golden brown and puffed up.

What To Serve With Lemon Blueberry Loaf

This sweet and zesty loaf is a perfect treat on its own, but it’s also delicious with:

• A cup of hot coffee or Earl Grey tea.
• A dollop of clotted cream or a simple vanilla glaze.
• A side of fresh fruit.

How To Store Lemon Blueberry Loaf

Store: Store the completely cooled loaf in an airtight container at room temperature. It will stay moist and delicious for up to 4 days.

Lemon Blueberry Loaf Nutrition Facts

• Calories: ~380 kcal per slice
• Protein: 4g
• Fat: 18g
• Carbohydrates: 50g
• Sugar: 30g

Nutrition information is estimated and may vary based on ingredients and cooking methods used.

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