In a bowl, mash avocado with a fork. Add goat cheese and continue mashing until well incorporated. Season with salt and pepper. Set aside.
Melt butter in a small fry pan over medium low heat. Crack egg gently into pan. Cover and cook for 4 minutes. Flip over and cook for 1-2 minutes (or to your liking).
While egg is cooking toast English Muffin.
Spread some avocado mixture on both halves of muffin. Place egg on top of one half. Cut into egg and use muffin to sop up the yolk. Enjoy!