Cut butter into flour and sugars until crumbly. Set aside 1/2 c. To remainder, add buttermilk, soda, egg and vanilla; beat well. Pour 1/3 batter into well greased and floured 9-cup Mini-Bundt pan. Combine reserved mixture, candy and nuts. Sprinkle over batter. Alternate remaining batter and candy nut mixture. Bake at 350 degrees for 35-45 min. To crush candy bars: place in freezer. When thoroughly chilled, place between 2 sheets of foil and roll with rolling pin.