In a mixer, cream butter and brown sugar until fluffy and creamy.
Add vanilla.
Add one cup of powdered sugar and beat, repeat until all sugar is incorporated, add milk as needed to keep it smooth.
Add desired amount of chocolate chips.
Use immediately
Recipe by Matthew's Puzzle - Autism Recovery, Gluten Free, Green Living Mom Blog at https://www.matthewspuzzle.com/2013/04/gluten-free-chocolate-chip-cookie-dough-frosting-recipe.html