Line the pan with parchment paper. I didn't do the sides because they can loosen like I showed in the video.
Add oil gradually and whisk.
Add milk gradually and whisk. Then add vanilla extract and whisk.
Gradually sift in the flour to the mixture and whisk.
Pour half of the mixture into a second bowl.
Whisk in the cocoa powder in one of the halves.
Preheat oven to 350 degrees Fahrenheit.
Scoop 2 large spoonfuls of a flavor and place into into the middle of the pan, into the center batter circle. 2 vanilla, 2 chocolate, and repeat. They will spread to make circles. Read comments below!
Place the cake into the oven for 30 minutes. Stick a toothpick into the center of the cake, or wherever it's thickest. Remove the toothpick from the cake.
If it doesn't have any batter on it and it's pretty clean, take it out of the oven. If not, place it back in the oven for a couple more minutes. Do the "toothpick test" again in a different location.
Cut a slice and look at how beautiful it is! (and delicious!) Credit to: realepicurean.com, visit the website it has tons of great stuff on there!