Bright, buttery, and balanced — topped with a swirl of blackberry frosting
A Cupcake That Feels Like Spring
There’s something about lemon desserts that feels instantly cheerful. Add poppy seeds and a fruity swirl of blackberry frosting, and you’ve got a cupcake that’s both classic and just a little bit bold.
These lemon poppy seed cupcakes are soft, full of lemon flavor, and stay wonderfully moist thanks to a mix of sour cream and butter. The blackberry frosting adds a deep, berry sweetness and a gorgeous natural hue that makes them stand out — no food coloring needed.
Snapshot
- Yields: 14 cupcakes
- Texture: Soft, moist, slightly dense crumb
- Flavor: Lemon-forward with a sweet berry finish
- Effort: Medium (extra step for the frosting)
- Perfect for: Spring parties, showers, or lemon lovers any time of year
Ingredients
For the Cupcakes
- 1½ cups all-purpose flour
- 1 tsp baking powder
- ½ tsp baking soda
- ¼ tsp salt
- ½ cup unsalted butter, softened
- 1 cup white sugar
- 2 tbsp lemon zest (from 1–2 lemons)
- 2 large eggs
- 1 tsp vanilla extract
- ⅔ cup sour cream (room temperature)
- 3 tbsp fresh lemon juice
- 1½ tbsp poppy seeds
For the Blackberry Frosting
- 1½ cups blackberries (fresh or frozen)
- 1 cup unsalted butter, softened
- 4 cups powdered sugar
- ¼ tsp salt
- 1–2 tbsp cream or milk (optional, for texture)
How to Make Them
1. Start with the Frosting Base (Optional Step)
If you’re making your own blackberry puree, start here. Blend the blackberries, strain to remove seeds, and simmer the puree until thick like jam (10–20 minutes). Cool completely.
2. Preheat & Prep
Preheat your oven to 350°F (175°C) and line a muffin pan with 14 paper liners.
3. Make the Cupcake Batter
- In one bowl, whisk together flour, baking powder, baking soda, and salt.
- In another large bowl, beat the butter, sugar, and lemon zest until fluffy.
- Beat in eggs one at a time, then add vanilla.
- Alternate adding the sour cream and dry ingredients in two parts, mixing gently.
- Stir in lemon juice and poppy seeds by hand.
- Fill each liner about ⅔ full.
4. Bake
Bake for 16–20 minutes, or until a toothpick comes out clean. Let them cool in the pan for 10 minutes before transferring to a wire rack.
5. Make the Frosting
- Beat the butter until smooth.
- Add 2 cups powdered sugar and salt.
- Beat in 2 tablespoons of the cooled blackberry puree.
- Gradually add the remaining sugar, adjusting texture with more puree or cream.
- Frost cooled cupcakes as desired.
Tips for Success
- Use fresh lemons for the best flavor — zest before juicing.
- Don’t skip the cooling — warm cupcakes will melt the frosting.
- Don’t overmix the batter once flour is added — it can make cupcakes dense.
- You can use store-bought blackberry preserves (3 tbsp) if short on time.
Storage & Make-Ahead
- Same day: Best served fresh. Store at room temp in a sealed container for up to 6 hours.
- Next day: Store frosted cupcakes in the fridge for up to 3 days.
- Make-ahead tip: Bake cupcakes and make the blackberry puree a day ahead. Store both separately, then make the frosting and assemble the day you serve.
FAQ
What do poppy seeds add to cupcakes?
Poppy seeds add a gentle crunch and nutty flavor that balances out the sweetness of the cake. They also give the cupcakes a slightly rustic, bakery-style texture without overwhelming the lemon.
Can I use bottled lemon juice?
It’s not recommended. Bottled lemon juice tends to be too sharp and bitter. Fresh lemon juice brings brighter, cleaner flavor — and zest is key for that fragrant lemony punch.
Can I make lemon poppy seed cupcakes ahead of time?
Yes. Bake the cupcakes and store them at room temperature for up to a day. The frosting (especially if using fresh blackberry puree) is best made fresh, but you can make the puree ahead and store it in the fridge until ready.
What frosting pairs best with lemon cupcakes?
This recipe uses blackberry buttercream, which is sweet, tangy, and naturally vibrant. If you want a simpler option, lemon or vanilla buttercream also pairs beautifully with these cupcakes.
Final Notes
These lemon poppy seed cupcakes feel fancy without being fussy. They’re a little nostalgic, a little playful, and completely satisfying — especially with that swirl of berry frosting on top.
Bake them for a birthday, a brunch, or just because you feel like bringing a little sunshine into the kitchen.
Lemon Poppy Seed Cupcakes
Ingredients
Method
- Lemon Poppy Seed Cupcakes
- Preheat the oven to 350F degrees and line 2 muffin pans with liners. You’ll end up with about 14 cupcakes in total.
- In a large bowl sift together the flour, baking powder, baking soda and salt. Give them a whisk.
- In a separate large bowl, beat the butter, sugar and lemon zest until fluffy.
- Beat in the eggs and vanilla extract.
- With the mixer on low speed, beat in about 1/2 of the sour cream followed by about 1/2 of the flour mixture. Turn off the mixer and scrape down the sides of the bowl.
- Repeat the process with the rest of the sour cream and flour mixture.
- Gently fold in the lemon juice and poppy seeds.
- Spoon the batter into the prepared muffin pans filling each about 2/3 full. You should get about 14 cupcakes.
- Bake 1 tray at a time on the middle rack of the oven for 16-20 minutes, or until the tops look set and an inserted toothpick comes out clean. Cool in the pan for at least 10 minutes, then continue cooling on a wire rack.
- Blackberry Frosting*
- Add the blackberries to blender or food processor and blend until smooth.
- Press the puree through a sieve to remove the seeds. I typically do about 1/2 at a time and use the back of a metal spoon to push it through.
- Transfer the seedless puree to a small-medium saucepan over low heat. Bring the mixture to a gentle simmer while stirring occasionally for 10-20 minutes, or until the puree is thick like jam. Remove from the heat and cool completely. You should have about 2-4 tablespoons in total.
- In a large bowl, beat the butter until soft.
- Turn the mixer down to low speed and beat in 2 cups powdered sugar and the salt.
- Beat in 2 tablespoons of the thick, cooled puree.
- Beat in the rest of the powdered sugar about 1/2 cup at a time, adding in a little more blackberry puree or cream as needed.
- Transfer the frosting to a piping bag (I used a 1M tip) and frost the cupcakes, or frost with a knife.
Notes
- You will need 1-2 medium sized lemons for this recipe. Zest the lemons first before squeezing the juice. Do not use lemon juice from the bottle because it is too sour and bitter.
- If you’d like a thin layer of frosting for each cupcakes instead of piping on the frosting, feel free to 1/2 the frosting recipe.
- Because the puree needs to cool fully before moving on with the frosting, I often make the blackberry puree first. Then make the cupcakes. By the time the cupcakes and baked and cooled – the reduced blackberry puree should be cooled and you’ll be ready to make the frosting.
- Instead of using fresh/frozen blackberries and boiling them down, you could use blackberry preserves from the grocery store. You will need 3 tablespoons total.
- I do not recommend doubling this recipe, as it leeds to over mixing the batter which can cause the cupcakes to be tough or sink in the middle.
- Storage and Make-Ahead Tips: I recommend making these cupcakes the day you plan to eat them. Store in an airtight container at room temperature for up to 6 hours, or in the fridge for up to 3 days. If you’d like to make the cupcakes the day before, make the cupcakes and store them in an airtight container at room temperature. Make the puree, cool it fully and store in an airtight container in the fridge. Then make the frosting the day you plan to serve the cupcakes.
- Nutrition information is based off 1 cupcake with frosting.
Calories: 462kcal | Carbohydrates: 61g | Protein: 3g | Fat: 24g | Saturated Fat: 14g | Cholesterol: 90mg | Sodium: 147mg | Potassium: 109mg | Fiber: 1g | Sugar: 49g | Vitamin A: 769IU | Vitamin C: 6mg | Calcium: 56mg | Iron: 1mg