• Preheat the oven to 325 degrees. Grease and flour three 8x2 inch round cake pans. Place a piece of parchment in the bottom of each pan. (Note that we used three layers- this recipe has been updated since our photos were taken. We will update the photos soon!)
• Put the first 5 ingredients into the bowl of your mixer. Mix on low speed for at least 30 seconds to combine.
• Add the softened butter (cut into pieces) mix on low speed just until it looks like coarse sand. The dry ingredients will be moistened/coated by the butter and will stick to together if you press some between two fingers. Don't over-mix or it will turn into a large dough-like ball.
• Add the eggs 1 at a time, mixing until blended. 
• Add the vanilla to the 1 ¼ cup buttermilk. With the mixer on lowest speed gradually pour into the mixer. Increase the speed to #2 or # 3 (on a KitchenAid mixer). Mix for about 2 minutes, batter will be smooth and fluffy. If you are using a hand mixer rather than a stand mixer, mix a bit longer.

MARBLING INSTRUCTIONS

• Mix 4 Tablespoons unsweetened cocoa powder with 3 to 4 Tablespoons very hot water. Stir until smooth & set aside.
• Put 1 ½ cups cake batter into a medium sized bowl and stir in the chocolate mixture to create chocolate batter. Set aside.
• Put about a cup of yellow batter into each of the three pans & spread, then add a few dollops of chocolate batter by the spoonful to each of the pans. Swirl with offset spatula or knife (we usually use something about ½ inch wide). Add more yellow batter by the spoonful, adding chocolate batter here and there until finished. Swirl this newly added yellow and chocolate. Be careful not to over-swirl- you'll lose the contrasting colors.
• Bake at 325 degrees for 25-30 minutes or until a toothpick inserted in the center comes out clean. Let the cake cool in the pans 5-10 minutes, then turn out.