Line your 9x9 inch baking pan with parchment paper or lightly grease it.

In a medium saucepan, mix the granulated sugar and cocoa powder together.

Pour in the milk and add the unsalted butter to the saucepan. Stir over medium heat until well combined and the butter has melted.

Increase the heat and bring the mixture to a boil, stirring constantly.

Let the mixture boil for exactly 5 minutes without stirring.

Take the saucepan off the heat and stir in the marshmallow cream, vanilla extract, and chocolate chips.

Quickly pour the fudge mixture into the prepared pan and spread it evenly.

Allow the fudge to cool at room temperature until set, about 2 hours.