01 - Preheat oven to 350°F. Grease and line two 9-inch round cake pans with parchment paper.
02 - In a large bowl, whisk together flour, sugar, baking soda, salt, and cocoa powder until well blended.
03 - In a separate bowl, combine oil, buttermilk, eggs, food coloring, vanilla, and vinegar. Mix thoroughly until smooth.
04 - Gradually add wet ingredients to dry ingredients, mixing until just combined. Avoid overmixing to prevent tough texture.
05 - Pour batter evenly between prepared pans. Bake for 28-32 minutes until toothpick inserted in center comes out clean.
06 - Let cakes cool in pans for 10 minutes, then invert onto wire rack to cool completely before frosting.
07 - Beat cream cheese and butter until smooth and creamy. Gradually add powdered sugar, vanilla, and salt. Beat until fluffy.
08 - Place one cake layer on serving plate and spread with frosting. Top with second layer and frost top and sides evenly.
09 - Chill assembled cake for at least 30 minutes before slicing. Decorate as desired with crumbs, berries, or chocolate shavings.