Avocado turns brown when it’s exposed to air, you can prep the filling ahead of time (even a day ahead, place it in plastic wrap like a tube, or a zipper bag, or pastry bag (do not cut tip off until using) place the filling into a piping bag with a star tip added, you can put the plastic wrap tube right into the piping bag the pipe before serving or an hour before and place in fridge. The yogurt and lime juice will help keep the color green as well. Do not use any avocado that has begun to turn brown, they are too ripe, the prettier the green inside the avocado the better.

So happy to hear you liked the recipe Emily. They really are so great for entertaining! Happy New Year!