For example, if you use 250 g of strained yogurt and 200 g of heavy cream, the total weight is 450 g. The amount of sugar necessary is 10% of the total weight, or 45 g. You can adjust the amount to taste.
Combine the heavy cream and sugar and whip until firm peaks form.
Add the strained yogurt and mix. Done!
This cream goes well with fruit, so I used it in fruit sandwiches. The cream is stiff, so you can pipe it out too.