I do 2 types:
Banana smoothie, 2-3 frozen farang bananas, ripe, 300ml carton soy milk. I wait until bananas are ripe then peel and freeze, no need for added sugar.
Berry smoothie, frozen strawberries, mulberries, cranberries (prefer these over mixed berries), 3 tablespoons of white sugar this matches the sweetness of high fructose syrup from shop smoothies.
Banana smoothie is like a healthy ice cream if it's thick, depends on the size of farang bananas, some much bigger than others