No-Fail Fudge

Directions

1. 1
   Line an 8-inch square pan with foil and grease the foil with 1 teaspoon butter; set aside.
2. 2
   In a large bowl, combine the confectioners sugar, cocoa and salt.
3. 3
   Melt remaining butter; add milk and vanilla.
4. 4
   Stir into sugar mixture until blended; whisk until smooth.
5. 5
   Stir in M&M's.
6. 6
   Immediately spread into prepared pan.
7. 7
   Refrigerate until firm.