R drew me a picture of a cake he wanted for his birthday. It was quite an elaborate three-layer cake with three different flavors inside.
Lemon on the bottom, chocolate in the middle and red velvet on the top.
Because I didn't want to do everything at once and at the last minute, I made one layer at a time and froze each one to make assembly much easier
I used half this recipe for a 9" cake pan for the bottom lemon layer
https://sallysbakingaddiction.com/lemon-cake/#tasty-recipes-66829
I used half this recipe for a 9" cake pan for the top red velvet layer
https://sallysbakingaddiction.com/red-velvet-layer-cake-with-cream-cheese-frosting/#tasty-recipes-66373
I also used the frosting recipe for the outside of the cake.
I had some whipped chocolate ganache that also went between the chocolate layer and the red velvet layer.