Salted Caramel Chocolate Cake

- Chocolate Cake: All-purpose flour, granulated sugar, unsalted butter, cocoa powder, eggs, whole milk, baking powder, baking soda, salt, pure vanilla extract.

- Salted Caramel Swiss Buttercream: Egg whites, granulated sugar, unsalted butter, homemade salted caramel sauce (prepared with granulated sugar, heavy cream, unsalted butter, and sea salt), salt.