Melt candy bars and 1/2 cup butter in a saucepan over low heat, stirring frequently. Once completely melted, remove from heat and set aside.
In a large mixing bowl, use an electric mixer to cream the sugar and 1/2 cup of softened butter until light and fluffy. Add eggs, mix well.
Add the salt and baking soda to the buttermilk and then add to the butter/sugar mixture. Add the flour and mix until well combined. Add the melted candy bars and vanilla and then pour into a well greased bundt pan and bake for 65 minutes at 350.
Make sure that the center is done and then cool the cake completely before inverting onto a serving plate.
To make the frosting, combine the sugar and evaporated milk in a saucepan over medium heat. Cook to soft-ball stage (234-240 degrees) and then remove from heat. Add chocolate chips and stir until melted. Blend in marshmallow creme. Spread over the cake.
Top with additional chopped Milky Way candy bars if desired. Enjoy!