Blueberry Cake Recipe – Step by Step Guide

Prepare the blueberry compote filling and blueberry puree

• You will use the blueberry compote filling in both the cake batter and as a cake filling. Prepare a 1 x batch of the blueberry cake filling recipe and allow it to cool. You can make it the day before and keep it refrigerated. Reserve 70 grams (¼ cup) for the cake batter and the remaining for the cake filling.

• You will use the blueberry puree in the cake batter and the frosting. Thaw the 170 grams of frozen blueberries in the microwave until completely thawed. Puree the blueberries with all the juice in a food processor until it resembles a fine puree. Reserve 78 grams (⅓ cup) of the blueberry puree for the buttercream (keep it in the fridge until using). The remaining 78 grams (⅓ cup) will be used for the cake batter.
  

Bake the Blueberry Cake

• Preheat Oven to 325 degrees. Line a ¼ sheet pan with parchment paper and lightly spray the bottom and sides of the pan with nonstick cooking spray (focus on the sides of the pan, the top of the parchment paper only needs a very light spray).
• Sift the Dry Ingredients in a bowl and then whisk until well blended. In a separate bowl, whisk the Wet Ingredients and the reserved 78 grams (⅓ cup) blueberry puree. Pour the wet ingredients over the dry ingredients and whisk until well blended.

• Add the reserved 70 grams (¼ cup) blueberry compote. Pour the melted salted butter over the batter and whisk until it is fully incorporated and the batter is smooth and shiny.

• Pour the blueberry cake batter into your prepared ¼ sheet pan. Spread the batter out until it is even throughout the pan all the way to the edges–an offset icing spatula works well for this.

• Bake on the middle or top rack (avoid bottom rack) of the preheated 325-degree oven for 18 minutes, then turn the oven down to 300 degrees. Set the timer for an additional 3-6 minutes, or until a toothpick or paring knife comes out mostly clean (watch closely towards the end of baking). A couple of moist crumbs on your knife are fine, but they shouldn’t look wet. Some ovens may require a longer baking time, and 2x batches may take a few more minutes in the oven.
• The delicate cake will be easiest to layer from cold or frozen–allow the cake to cool, then wrap the cake in the pan thoroughly in plastic wrap. Freeze the cake in the pan for at least 2 hours or up to 2 weeks ahead of time (brush the cake with simple syrup if freezing for more than a couple of days–see Note #4).

Make the blueberry buttercream frosting

• If using instant clerjel, whisk it thoroughly with the powdered sugar and set aside.
• Using a stand mixer (preferred) or handheld mixer and a large bowl, beat the cream cheese until broken up and softened.
• Add the room temperature salted butter and continue to beat until there are no lumps, scraping the sides of the bowl as needed.
• Once the cream cheese/butter mixture is very smooth and creamy without lumps, slowly sprinkle in the powdered sugar mixture while the mixer is on low. The mixture will be thick, but continue to slowly blend on low until it is fully incorporated.

• Add the pure vanilla, blueberry emulsion, and reserved blueberry puree. Scrape down the sides of the bowl. Then beat the buttercream on high for two-three minutes. This important step will add air into the buttercream and make it light and fluffy. The instant clearjel will cause the buttercream to thicken over the next 10 minutes. If you didn’t use instant clearjel, you may wish to add up to an additional 1 cup of powdered sugar to reach a thicker frosting. The frosting can be made a day or two in advance and refrigerated, but remove it from the fridge 1-2 hours before decorating your cake so it can be easily spread.
  

Layer, Decorate and Serve

• The easiest way to layer the blueberry cake is to layer the cake from frozen the day before you plan to serve it. If serving the cake the same day you are layering it, use refrigerated cake layers instead of frozen. Cut the cake layers with cake rings as described in How to Bake and Layer Cakes Like a Pro.

• Spread a ¼ inch layer of blueberry buttercream on top of your bottom cake layer, then pipe a ½” tall ring of buttercream around the edge of the cake. An offset icing spatula (I use the small and medium-size on all my cakes) helps with this. Evenly spread half of the blueberry filling on top of the buttercream within the ring, making sure it is not taller than the ring of buttercream (as seen in my recipe video). Repeat with the second cake layer. The remaining cake scraps can be used for cake truffles if desired.

• I recommend frosting a thin crumb coat of buttercream on the outside of the cake which will catch all the crumby edges, then allow it to set up in the freezer for about 10 minutes until the buttercream is firm, before adding the final coat of blueberry buttercream. Drizzle with Simple White Chocolate Drip and fresh blueberries, if desired. The remaining blueberry buttercream can be used to pipe rosettes with a 1M star tip and disposable piping bag.
  
• Allow the completed cake to set up in the fridge, but remove it from the fridge 2-3 hours before serving so it can come back to room temperature. This blueberry cake has the best texture at room temperature. Enjoy!