Marble Pound Cake

Ingredients:
2/3 cup butter, cubed room temperature
1 3/4 cups all purpose flour
1 tablespoon baking powder
1 teaspoon salt
1 cup sugar
3 pieces eggs
1 teaspoon vanilla extract
2/3 cup buttermilk
1/3 cup cocoa powder
1/3 cup boiling water

Directions:
1. Preheat oven to 350 F. Butter a 9-by-5-inch loaf pan, set aside.
2. Whisk together flour, baking powder and salt.
3. In a bowl of an electric mixer fitted with a paddle attachment, beat butter and sugar until light and fluffy.
4. Add eggs one at a time, scraping the sides of the bowl after each addition. Add the vanilla.
5. Add the flour mixture in two batches alternately with the buttermilk beginning and ending with flour. Set aside one-third of the batter.
6. In a small bowl, mix cocoa powder with the boiling water. Stir until smooth. Add the cocoa mixture to the reserved cake batter and stir until well combined.
7. Spoon the batter into the prepared pan in two layers, alternating a scoop of vanilla batter and chocolate to look like a checkerboard. Then, run a knife on the batter with a swirling motion to create a marble effect.
8. Bake in the oven for 40-45 minutes or until cake tester inserted comes out clean. Rotate the pan halfway through the baking time.