Blend the avocado halves, the garlic, lemon juice, chicken stock and jogurt until you have a smooth consistency.
Season with salt and pepper.
Transfer the soup into a bowl and cover it.
Chill the soup in the fridge for at least 2 hours before you serve it.
Fill the soup into glasses and crush some tortilla chips over the top. Then dust with some cayenne pepper and serve immediately.
Instead of the tortilla chips and cayenne pepper, you can sprinkle some fried bacon bits over the top of the soup.