01 -
Preheat oven to 177°C. Grease three 20-cm round cake pans with non-stick spray, line the bottoms with parchment paper, and re-spray the pans.
02 -
Whisk flour, granulated sugar, baking powder, and salt together in a medium bowl. Set aside.
03 -
In a stand mixer with paddle attachment, beat eggs, buttermilk, sour cream, vegetable oil, orange juice, vanilla extract, and orange zest until homogeneous.
04 -
With mixer on low speed, add half the dry ingredients to the wet mixture and combine for about 30 seconds. Add remaining dry ingredients and mix just until no dry streaks remain. Avoid overmixing.
05 -
Divide batter evenly among prepared pans. Bake for 23–27 minutes, until a toothpick emerges with moist crumbs. Allow cakes to cool slightly, then transfer to racks to cool completely. Trim domed tops for a level surface.
06 -
In a saucepan over medium heat, combine cranberries, sugar, orange juice, zest, and cinnamon. Stir frequently until cranberries burst and mixture thickens, about 10 minutes. Cool fully before assembly.
07 -
In stand mixer, beat butter, salt, and orange zest until light and smooth. Gradually add 950 g powdered sugar, alternating with orange juice and heavy cream, mixing until fluffy and spreadable.
08 -
Beat butter and salt until pale and aerated. Add sifted powdered sugar a few cups at a time, incorporating cream to maintain spreadable consistency. Beat until very smooth, then tint with food coloring as desired.
09 -
Warm heavy cream in saucepan or microwave until simmering. Pour over chopped white chocolate and let sit. Stir until smooth. Add optional icing coloring for bright white color. Allow ganache to cool to room temperature.
10 -
Place a small amount of buttercream on cake board, set first cake layer. Spread orange buttercream on top, pipe a rim around edges, and fill with cranberry orange filling. Stack second layer and repeat. Place third layer with flat side up.
11 -
Apply a thin layer of orange buttercream over entire cake and refrigerate for 10–15 minutes until set.
12 -
Pour cooled white chocolate ganache on top of the cake, spreading with offset spatula so it coats the sides. Smooth with cake scraper and refrigerate until firm.
13 -
Using the tinted vanilla buttercream, pipe tree decorations around the cake sides in desired colors and shapes. Decorate creatively, adding sugared cranberries if desired.