Place the crushed biscuits in a blender container. Blend them into a fine powder.
Melt the butter in a saucepan.
Then, add the biscuit powder. Stir and mix thoroughly with a spoon until you get a uniform, crumbly mass.
Transfer the crumb mixture to a glass or small jar, press it firmly, and smooth it out. Place in the refrigerator.
In a bowl, combine the yogurt, cream, and sweetener. Stir and mix thoroughly with a spoon until you get a smooth, thick mass.
Take out the dish with the base and evenly spread the yogurt layer on top. Smooth it out and put it back in the refrigerator.
In a bowl, place the jam (e.g., strawberry, raspberry, rose, or other) and stir well to make it less firm.
Take the dish with the dessert out and evenly spread the jam on top.
You can eat the dessert right after preparing or after chilling. Store in the refrigerator for up to 2 days.