This red velvet marble cake recipe is perfect for those who love red velvet cake. It's made with all-purpose flour, baking powder, salt, unsalted butter, granulated sugar, eggs, vanilla extract, milk, cocoa powder, and red food coloring. The cake is moist, tender, and has a beautiful swirl pattern. The red velvet flavor adds a rich and decadent twist to the cake and makes it perfect for any special occasion.