Preheat the oven to 325° F. Grease 12-cup Bundt pan.
In 4-quart microwave-safe bowl, combine butter, syrup, and nougat bars. Heat 5 to 5 1/2 minutes on medium (50% power), whisking once. Whisk until smooth. Whisk in sugar, then buttermilk, vanilla extract and eggs. Stir in the flour, cocoa, salt and baking soda.
Pour batter into pan. Bake 1 hour 30 to 40 minutes or until wooden pick inserted in center comes out almost clean. Cool in pan on wire rack 10 minutes. Loosen cake from pan; invert onto rack to cool.Makes 4 Source: