Preheat your oven to 350°F (175°C) and grease two round cake pans to ensure easy release.
In a large mixing bowl, cream together the softened butter and sugar until light and fluffy.
Add the eggs one at a time, mixing well after each addition. Stir in the vanilla extract for that extra flavor kick!
In a separate bowl, whisk together the flour, baking powder, and salt.
Gradually add the dry ingredients to the wet mixture, alternating with the milk, stirring until you have a smooth batter.
Divide the batter into two bowls. If you'd like to create two colors, add food coloring to one of the batters and mix well.
Pour the batters into the prepared pans, alternating colors, and use a knife to swirl them gently together for a mesmerizing effect.
Bake for 25-30 minutes or until a toothpick inserted into the center comes out clean.
Allow the cakes to cool before removing from the pans and frost as desired.