Heat oven to 350°F. Grease and line two 8-inch round cake pans with parchment.
Whisk flour, sugar, cocoa, baking soda, and salt in a large bowl until evenly combined.
Combine buttermilk, oil, eggs, vanilla, vinegar, and red food coloring in a separate bowl; whisk until smooth.
Pour the wet mixture into the dry ingredients. Stir just until the batter is silky and no dry spots remain.
Divide batter between pans and smooth the tops. Tap pans gently to release large air bubbles.
Bake 25–30 minutes, until a tester comes out clean and the tops spring back lightly.
Cool cakes in pans 10 minutes, then turn out to a rack and let cool completely.
Beat cream cheese and butter until fluffy. Gradually mix in powdered sugar, vanilla, and salt. Add cream until spreadable.
Level cake layers if needed. Frost the first layer, top with the second, then cover the whole cake with remaining frosting.
Notes
For cupcakes, divide batter among 18–20 liners and bake 18–22 minutes. Chill the crumb-coated cake 15 minutes for cleaner final frosting. Store covered in the fridge up to 4 days; bring to room temp before serving.This recipe is an original creation inspired by classic Decadent Red Velvet Recipes flavors. All ingredient ratios and instructions are independently developed.