I made mayonnaise using olive oil and plain yogurt, with a pinch of sugar to offset the tartness of the yogurt. I used this to make chicken salad with cooked chicken, celery and dried cranberries.
It tasted good to me, creamy and moist, which is what I wanted. I also like yogurt, so maybe if that weren’t true maybe I wouldn’t like this as much. I didn’t measure anything, but I used maybe 3/4 cup yogurt and 1/4 cup olive oil.