1. Using the paddle attachment, whip together butter, cocoa powder, and vanilla.
  2. Scrape the bowl using a rubber spatula, getting all the edges.
  3. Add evaporated milk, then powdered sugar a cup at a time. Scrape the bowl and whip on high for 1 minute.
2 1/2 sticks Butter - softened:
1 1/2 cups Cocoa Powder:
1 T. Vanilla:
1 can Evaporated Milk:
9 cups Powdered Sugar: