1. Using a double boiler method, whisk egg whites and sugar in the mixer bowl. Place over boiling water. Whisk constantly for 4 minutes.
  2. Remove from heat. Using whisk attachment, whisk on high for 5 minutes.
  3. Turn speed to medium. Slowly add chunks of soft butter.
  4. Add vanilla. Whip for 2 minutes. Scrape bowl.
  5. Add heavy cream. Whip for 2 minutes.
6 Egg Whites:
1 1/2 cups Sugar:
2 cups Butter - softened:
2 tsp. Vanilla:
2 T. Heavy Cream: