Ingredients

  • 1 cup sugar
  • 12 cup unsalted butter, room temperature
  • 2 cups all-purpose flour
  • 1 teaspoon baking powder
  • 1 teaspoon baking soda
  • 14 teaspoon salt
  • 1 (8 ounce) container sour cream (I used nonfat plain yogurt)
  • 1 teaspoon vanilla extract
  • 2 large eggs
  • 2 ounces semisweet chocolate, grated
  • 1 teaspoon ground cinnamon

Method

  • Preheat oven to 350F.
  • Butter and flour a 9 by 5-inch loaf pan.
  • Lightly tap out excess flour.
  • Using an electric mixer, cream the sugar and butter together in a large bowl until light and fluffy.
  • Lower the mixer speed, and stir in the flour, baking powder, baking soda, and salt.
  • Beat just until blended.
  • Add the sour cream and vanilla and beat just until well combined and smooth.
  • Beat in the eggs just until well blended.
  • Spread half of the batter into the pan.
  • In a small bowl, mix the grated chocolate and cinnamon together.
  • Sprinkle half of the chocolate mixture over the batter.
  • Top with the remaining batter.
  • Sprinkle the rest of the chocolate mixture over the top.
  • Using a knife, carefully swirl in the chocolate mixture to marbleize.
  • Bake until a toothpick inserted into the center comes out clean, about 55 minutes.
  • Place pan on a wire rack and let the cake cool for 10 minutes.
  • Run a knife around the edges of the pan, then turn out onto the rack to cool completely.
  • (The cake be prepared 1 day ahead.
  • Wrap well in foil and store at room temperature).