Blueberry Layer Cake

Step 1

In the bowl of a stand mixer or with a hand mixer, beat together the butter, salt, vanilla and blueberry powder. Add the powdered sugar (sift it in if it’s lumpy) and beat to combine, at least 3 minutes, scraping the bottom and sides as needed. Add milk or heavy cream to the mix until you have a smooth buttercream. Place it in an airtight container and leave it at cool room temperature.

Step 2

In a small pot, cook over medium heat all the ingredients together for about 5 minutes, until the blueberries soften and a few of them burst. Place in a container in the fridge. It will thicken as it cools.

Step 3

Using a blender or food processor, puree 1-2 cups of fresh blueberries. Sieve the mixture to remove seeds and then cook it in a pot over medium heat, until it’s reduced, thickened and much of the water has evaporated. You’ll need ½ cup for the cake. Let it cool fully before adding to the cake batter.

Step 4

Preheat the oven to 325 F. Butter and flour two 8” round cake pans.

Step 5

In the bowl of a stand mixer fitted with the paddle attachment, beat together the butter, sugar, cake flour, baking powder, soda and salt until the mixture is fully combined and sandy.

Step 6

Add the eggs, one at a time, allowing for each to be fully combined before adding another. Once all four are in, let the mixture run for a few minutes, scraping the bottom of the bowl as needed.

Step 7

With the mixer on, slowly pour in the blueberry reduction, blueberry powder, lemon juice and kefir. Once the batter is fully mixed, divide it between the two cake pans.

Step 8

Bake until top is firm when pressed or a cake tester comes out clean, about 40 minutes.

Step 9

Stir the buttercream really well with a rubber spatula, you’ll see the color change as you do. Put it into a large piping bag (this will help you create ‘walls’ so that the filling doesn’t leak).

Step 10

Once the cakes have cooled, use a bread knife to slice off the tops of the cake domes. Pipe a border of buttercream around the top of one of the cakes. On the top of the other cake, spread a thin layer of buttercream.

Step 11

Spread the filling inside the buttercream border and place the second cake face down. Pipe the rest of the buttercream around the cake and on the top and smooth it around with an offset spatula.

Step 12

Get ready, blueberry heaven is about to happen.