What is the name of this polish snack?

When I was younger I had a polish friend who’s mum made the most delicious snack ever and I wish I knew what it was! It was kind of like fudge - creamy and chewy slabs she used to cut into pieces. I believe it was made with some kind of drink powder, like a hot drink powder that came in a bag. The snack was brown but I don’t think it was chocolate flavour. Can anyone help me identify this?