Vegan Chocolate Frosting

This is the best vegan chocolate frosting I've ever made.  I adapted a regular frosting recipe:

1/4 c. butter either vegan butter or some combo of palm oil/coconut oil
1 c. sugar
1/4 c. RICE milk
1/2 c. VEGAN chocolate chips
1 tsp. vanilla

Bring butter, milk and sugar to a boil, add chocolate chips and vanilla. Beat until cool. Will frost a 9 x 13 cake.