Hello Anne, I haven't made any for ages but they are called no bake slices in NZ - usually they are made with any combination of crushed sweet biscuits, melted butter, sweetened condensed
milk and have dried fruit, chocolate chips, marsh mallows etc mixed in.
I find them a little too sweet for our personal taste but they are popular for children's lunchboxes.
Some bakeries
sell "lolly cakes" that are a no bake slice.