In a large bowl, beat the butter and cream cheese together until smooth.

Add the vanilla and mix in.

Add in powdered sugar (I like mine thick and fluffy so I use more) and then milk to make it smooth enough to spread.

Using a cookie scoop, add the frosting to one cookie, top with another and press gently to push and even, rounded frosting.

Roll in sprinkles and serve.

Store in a container with a tight lid.