In a food processor, process the avocado until mostly smooth. Add the rest of the ingredients and process again until smooth, scraping down the bowl as needed.
Transfer to the fridge until ready to use. The frosting will keep in an airtight container in the fridge up to 3 days. I recommend making the frosting the day of or the day before frosting your cake.
Enjoy!!!
(Recipe adapted from Oh She Glows)