Peel and remove the stone from the avocados.

In a blender or food processor, puree the avocado flesh.

Add lemon juice, chopped chives, chili powder, and salt to the blender.

Blend until smooth.

Allow the mixture to chill in the refrigerator for a few hours before serving.

To serve, add a dollop of sour cream, stir through, and enjoy the soup chilled.