Mahogany Cake

1 . Stage

Preheat oven to 350 degrees F (175 degrees C). Grease a 9x12-inch baking pan.

2 . Stage

Stir buttermilk and baking soda together in a bowl until dissolved and foaming.

3 . Stage

Beat sugar and butter together in a bowl using an electric mixer until smooth and creamy. Beat the first egg into butter mixture until completely blended; beat in the second egg until incorporated.

4 . Stage

Whisk flour and cocoa powder together in a bowl. Beat flour mixture, alternating with buttermilk mixture, into creamed butter mixture using an electric mixer until batter is smooth. Pour batter into the prepared baking pan.

5 . Stage

Bake in the preheated oven until a toothpick inserted in the center of the cake comes out clean, 30 to 40 minutes. Cool cake for 30 minutes.