Line a square (8x8) pan with parchment paper.
Combine sugar, cocoa, salt, butter, milk, and fluff in a large saucepan.
Heat over low heat, stirring till blended, then increase to medium heat and bring to a boil.
Stir constantly for 5 minutes while the mixture boils.
After 5 minutes, remove from heat and stir in vanilla and chocolate chips until melted, smooth, and fully combined.
Pour into pan and refrigerate for at least 2 hours.
Once chilled, cut into pieces and enjoy!