Step 1: Prepare Cake Batter

In a large microwave-safe bowl, combine sugar, milk and butter.

Step 2: Bake and Serve

Place the bowl in oven and bake for 20 minutes. Remove the bowl from microwave and stir the batter well. Add chocolate chips, marshmallow cream, vanilla and walnuts in the batter. Stir until it smoothens. Butter the pan. Pour into prepared pan and cool completely before cutting. Store the chocolate fudge candy in an airtight container.