Step 1: Preheat oven to 350°F. Grease and line two 8-inch cake pans. Proper lining ensures easy release without tearing delicate cake layers.
Step 2: Whisk flour, sugar, cocoa powder, baking soda, and salt. Even distribution prevents uneven rise.
Step 3: Mix oil, eggs, vanilla, and food coloring separately. Add to dry ingredients, followed by buttermilk and vinegar. Mix just until combined — overmixing creates dense cake texture.
Step 4: Divide batter evenly and bake for 30–35 minutes until a toothpick shows moist crumbs. Cool completely.
Step 5: Reduce oven temperature to 300°F for cheesecake baking.
Step 6: Beat cream cheese and sugar until smooth. Add sour cream, then eggs one at a time. Fold flour gently to maintain creamy consistency.
Step 7: Pour batter into lined pans and place inside a shallow water bath. Bake for 25 minutes until edges are set but center slightly jiggles.
Step 8: Turn oven off and crack door open. Allow cheesecakes to cool gradually — this prevents surface cracking.
Step 9: Chill cake and cheesecake layers overnight for stable assembly.
Step 10: Prepare frosting by beating butter and cream cheese until fluffy. Gradually add powdered sugar and vanilla.
Step 11: Layer in this order: Red velvet cake, Frosting, Cheesecake layer, Frosting, Second cake layer, Final cheesecake layer, Chill briefly to stabilize.
Step 12: Frost entire cake smoothly and decorate as desired.