Chilled Avocado Yoghurt Soup

1 large avocado
1/2 cup yoghurt
2 cups vegetable stock
Salt
1/8 tsp white pepper
Dash of cayenne
Dash of garlic powder
1 tsp chopped chives

Blend avocado, yoghurt and stock until smooth.
Add spices, blend.
Sprinkle with chopped chives.
Chill.