This post may contain affiliate links. Read my disclosure policy. This Blackberry cake is soft and moist and has a fluffy lemon blackberry buttercream frosting. The lemon juice cuts the sweetness and brightens up the whole cake. You’ll enjoy every bite as it hits your taste buds; sweet, tart and tangy. And of course the fresh blackberries were plump, juicy and wonderful! I made this blackberry cake for my niece’s birthday and it was…good and so pretty (with decor inspiration from Allie)! Then I kept working on the cake, adding more lemon and the results were fantastic. Thankfully another niece was having a birthday the following weekend so it became her birthday cake. This was much safer than leaving the cake at home with me, alone – with just the cake and I – and a fork. No one even noticed that I had taken out a slice to photograph it and then carefully replaced it and patched the frosting #smooth. My family was completely smitten with this cake!
Blackberry Cake Ingredients:
6 large eggs, room temperature 1 cup granulated sugar 1 cup all-purpose flour *measured correctly 1/2 tsp baking powder
Simple Lemon Syrup:
3/4 cup warm water 1 Tbsp granulated sugar 4 Tbsp Lemon Juice (from 1 large lemon)
Blackberry Frosting Ingredients:
3 cups powdered sugar 3 sticks (1 1/2 cups) unsalted butter, room temperature 8 oz Cream cheese, softened at room temperature 1/2 tsp salt (I used fine sea salt) 2 packages (6 ounces each) blackberries, divided (1 cup for frosting, 1 cup sliced for layers, 6 berries for decor). 2 Tbsp fresh lemon juice from 1 medium lemon Crystal sprinkles, optional
How to Make the Blackberry Cake:
Watch the video before you get started:
Whisk together 1 cup flour and 1/2 tsp baking powder then sift this mixture into fluffy egg mixture one third at a time. Fold with a spatula with each addition just until incorporated. Scrape spatula from the bottom to catch any pockets of flour and stop mixing when no streaks of flour remain. Do not over-mix or you will deflate the batter.
Divide evenly between prepared cake pans (it helps if you have a kitchen scale to weight the pans). Bake at 350˚F for 23-28 minutes (my oven took 25 min), or until top is golden brown. Remove from pan by sliding a thin spatula (here’s the one I love for cakes) around the edges then transfer to a wire rack and remove parchment backing. Cool cakes to room temperature then slice layers equally in half with a serrated knife.
How to Make Lemon Blackberry Frosting:
Combine 2 Tbsp lemon juice with 1 cup blackberries in small saucepan. Simmer 6-7 minutes or until berries easily mash up with a fork then turn off heat. Strain through a fine mesh Strainer, pushing the blackberries through with a spatula until only seeds are left in strainer. Discard seeds and set the puree aside to cool completely to room temp (you should get 5 Tbsp puree).
In the bowl of an electric stand mixer fitted with whisk attachment, cream together 3 sticks butter, 3 cups powdered sugar and 1/2 tsp salt on low speed until combined, scraping as necessary. Increase speed to medium-high and beat until white and fluffy (2 to 3 min).
Add cream cheese 1-piece at a time and mix until combined then continue to beat 2 min until fluffy, scraping down the bowl as needed. With the mixer on, drizzle in blackberry syrup 1 Tbsp at a time then beat another minute.
How to Assemble Blackberry Cake:
Slice 1 cup blackberries and set aside. Make your lemon syrup by combining 3/4 cup warm water, 1 Tbsp granulated sugar and 4 Tbsp Lemon Juice.
Place first cake layer on serving platter cut-side up. Brush with 1/4 of the lemon syrup. Spread frosting over the top and layer with 1/3 sliced berries. Repeat with remaining layers placing the final layer cut-side-down, then frost the top and sides. (Tip: For the smoothest results, reserve flattest cake-layer for the top)
Pipe remaining frosting onto cake. For the roses, I used a closed star Wilton 2D tip (here’s a tutorial I created awhile back for how to pipe frosting roses). Decorate with remaining blackberries. I sprinkled with sugar crystals since it was my niece’s princess party birthday cake :).
