Black Death Cake

1 pound butter, softened
3 cups sugar
6 eggs
3 1/2 cups flour
1 cup cocoa
1 cup plain nonfat yogurt
2 teaspoons vanilla
2 teaspoons baking powder

Cream butter and sugar. Add eggs and beat well. Add two cups flour and beat well. Mix in yogurt and extract. Combine remaining ingredients and mix well. Butter 10" Bundt pan and dust with cocoa powder. Pour batter into pan. Bake at 350ºF about an hour or until cake pulls away from edges of pan. Cool in pan for 20 minutes, remove and finish cooling.