Butter, chocolate chips, granulated sugar, brown sugar, cocoa powder, salt, flour, red food colouring, vanilla extract, cream cheese, eggs
Melt butter and chocolate chips together in the microwave. Let it cool slightly, then add granulated sugar, brown sugar, cocoa powder, and a pinch of salt.
Add eggs, vanilla extract, red food coloring, and flour to the chocolate mixture. Stir until the batter is smooth and vibrant.
In a separate bowl, beat cream cheese, sugar, egg and vanilla extract until smooth. Set aside the cheesecake mixture.
Pour the red velvet batter into a greased baking pan and spread evenly. Save some for topping.
Pour the cheesecake mixture over the red velvet layer. Drop spoonful of the reserved red velvet batter on top.
Use a knife to swirl the red velvet and cheesecake batter for a marble effect.
Bake the cake at 350°F (175°C) for 30–35 minutes. Cool completely and slice into squares.