Lemon Blueberry Olive Oil Cake

By Lily | Last modified on Mar 19, 2026

Featured in: Desserts

Indulge in the perfect harmony of bright, zesty lemon paired with juicy, roasted blueberries in this soft, fragrant cake. Enhanced by smooth olive oil, it delivers a moist, bakery-quality texture that’s nothing short of irresistible. Each bite offers a burst of citrus balanced by the rich aroma of olive oil and the natural sweetness of blueberries.

This cake is beautifully crowned with a tangy lemon buttercream frosting and a luscious blueberry filling, making it a standout dessert for gatherings or a special treat to brighten your day. Easy to prepare yet impressive in flavor, it’s sure to become a favorite.

Why You’ll Love This Recipe

Roasting blueberries intensifies their flavor, lending a deep, jammy sweetness that complements citrus perfectly.
Olive oil adds moisture and a subtle richness unlike traditional cake fats.
The tangy lemon buttercream elevates the cake, offering a refreshing finish.
Balanced ingredients create a textured crumb that feels indulgent but not heavy.

Ingredients

Fresh Blueberries: Juicy and ripe berries roasted with spices to deepen their sweetness and add warmth.
Olive Oil: Adds moistness and a subtle fruity richness that enhances both blueberries and lemon.
Maple Syrup: Natural sweetener used during roasting to accentuate blueberry flavor without overpowering.
Dessert Spice Blend: A warm mix of cinnamon and vanilla that complements the berries’ natural tang.
All-Purpose Flour: The main structure provider, used alongside cake flour for balanced texture.
Cake Flour: Creates a tender crumb, delivering softness that melts in your mouth.
Baking Powder: Leavening agent to ensure the cake rises light and fluffy.
Sugar: Sweetens the cake while helping with crumb and moisture retention.
Lemon Zest: Bright, aromatic citrus peel that infuses the batter with fresh lemon notes.
Sea Salt: Enhances all flavors by balancing sweetness and highlighting citrus and spices.
Unsalted Butter: Adds richness and tenderness to the cake; softened for easy mixing.
Eggs: Provide structure and richness; room temperature for stable emulsification.
Lemon Juice: Freshly squeezed for tang and acidity that balances sweetness.
Buttermilk: Adds moisture and a subtle tang, contributing to the cake’s tender texture.
Blueberry Jam: Blended with lemon juice for a fruity filling that ties the layers together.
Powdered Sugar: Sifted for a smooth, lump-free lemon buttercream frosting.
Milk or Cream: Adjusts the buttercream to a silky, spreadable consistency.

Instructions

Roast the Blueberries: Preheat your oven to 375°F (190°C). Toss the fresh blueberries gently with olive oil, maple syrup, and the dessert spice blend or cinnamon and vanilla. Roasting softens the berries, intensifies their sweetness, and creates a syrupy texture that enhances the overall flavor of the cake. Roast for about 15 minutes until the berries are soft and slightly jammy. Allow them to cool completely before folding into the batter.
Prepare the Cake Batter: Reduce oven temperature to 350°F (175°C) and grease your cake pans thoroughly. In a medium bowl, whisk together all-purpose and cake flours, baking powder, and sea salt to ensure even leavening and balanced flavor. In a separate large bowl, beat softened butter with sugar until light and fluffy; this step traps air to give the cake its tender crumb. Add eggs one at a time, mixing well after each addition to maintain emulsion. Stir in lemon zest, olive oil, and fresh lemon juice to infuse bright citrus notes and moisture. Alternate adding the dry ingredients and buttermilk, starting and ending with the dry mix, folding gently to keep batter airy. Finally, fold in the cooled roasted blueberries carefully to distribute evenly without breaking them up.
Bake the Cake: Divide the batter evenly between the prepared pans, smoothing the tops. Bake in the preheated oven for 35 to 40 minutes, or until a toothpick inserted in the center comes out clean. Baking at a consistent temperature ensures even cooking and a moist crumb. Once baked, allow the cakes to cool completely on wire racks to prevent condensation during frosting.
Make the Blueberry Filling: Combine blueberry jam with fresh lemon juice in a small bowl. The lemon juice brightens the jam’s flavor, balancing sweetness and adding a fresh citrus note perfect for the cake’s layers.
Prepare the Lemon Buttercream: Beat softened butter until creamy and pale. Gradually add sifted powdered sugar to avoid lumps and ensure a smooth frosting. Mix in fresh lemon juice and 4 to 5 tablespoons of milk or cream, adjusting to achieve a light, fluffy texture that spreads easily but holds shape perfectly on the cake.
Assemble the Cake: Place one cake layer on a serving plate or cake stand. Spread the blueberry filling evenly over the top to add a fruity, tangy contrast inside. Position the second cake layer on top and frost the entire cake with the luscious lemon buttercream. This finishing touch complements the cake’s flavors while adding creamy texture and visual appeal.
Serve and Enjoy: Slice the cake into 10 to 12 portions. Each bite offers a moist, flavorful experience bursting with citrus and berries – perfect for celebrations or an indulgent everyday treat.

You Must Know

Roasting blueberries is essential: it concentrates their sugars and adds warm spice notes for a complex flavor.
Use room temperature ingredients to ensure a smooth, well-emulsified batter and better rise.
Be gentle folding in blueberries to prevent color bleeding and preserve texture.
Let the cake cool fully before frosting to avoid melting your buttercream.

Storage Tips

Store the assembled cake covered in the refrigerator for up to 4 days to maintain freshness. Wrap leftovers tightly to prevent drying and bring to room temperature before serving to enhance flavor and texture.

Serving Suggestions

This cake pairs beautifully with a cup of hot tea or freshly brewed coffee for a perfect afternoon treat. Garnish with fresh blueberries and lemon zest for a vibrant presentation when serving to guests.

Professional Tips

For best results, sift flours before measuring to avoid heaviness.
If cake flour is unavailable, substitute with all-purpose flour but reduce quantity slightly to maintain tenderness.
Use high-quality olive oil with fruity notes for a richer flavor profile.
Consider adding a splash of vanilla extract to the batter for extra depth without overpowering lemon.

FAQs

Can I use frozen blueberries?: Fresh blueberries give the best texture, but if using frozen, thaw and drain excess moisture before roasting to avoid soggy batter.
What if I don’t have buttermilk?: Mix 1 cup milk with 1 tablespoon lemon juice or white vinegar, let sit for 5 minutes to curdle, then use as a buttermilk substitute.
Can I make this cake vegan?: Substitute eggs with flax eggs or commercial egg replacers, use plant-based butter and milk alternatives to create a vegan version, though texture will differ slightly.
Why is olive oil used instead of other oils?: Olive oil adds a subtle fruity richness and helps keep the cake moist, differentiating it from cakes using neutral oils or butter alone.
How do I prevent the cake from drying out?: Measure ingredients accurately, avoid over-baking, and store the cake wrapped to retain moisture.
Can I freeze the cake?: Yes, freeze unfrosted cooled cake layers tightly wrapped for up to 3 months. Thaw before frosting and serving.
Is the lemon buttercream too sweet?: The buttercream balances sweetness with fresh lemon juice, but you can adjust sugar and lemon amounts to your preference.