01 -
Preheat oven to 350°F. Grease and line a 13x18-inch half-sheet pan with parchment paper to ensure easy cake removal and even baking.
02 -
In a large bowl, sift together flour, granulated sugar, baking soda, cocoa powder, and salt until evenly mixed and smooth.
03 -
In a separate bowl, whisk together vegetable oil, buttermilk, eggs, red food coloring, white vinegar, and vanilla extract until fully incorporated and smooth.
04 -
Gradually fold the wet mixture into the dry ingredients, stirring gently with a spatula until just combined to maintain tenderness; avoid overmixing.
05 -
Pour the batter evenly into the prepared pan, spreading with an offset spatula. Bake for 20 to 25 minutes until a toothpick inserted in the center comes out clean and the cake springs back when lightly pressed.
06 -
Allow the cake to cool in the pan on a wire rack for 15 to 20 minutes, then lift out using the parchment overhang. Let it cool completely before applying frosting.
07 -
Beat softened cream cheese and butter until fluffy. Gradually add powdered sugar, vanilla extract, and a pinch of salt. Mix until smooth, adding 1 to 2 tablespoons heavy cream to achieve a spreadable, silky consistency.
08 -
Spread the cream cheese frosting evenly over the cooled cake. Arrange fresh raspberries and blueberries across the top for a vibrant and festive finish.