Dutch supermarkets have really improved in this regard the past few years. Many of their own-brand products now have clearly separable packaging (i.e. a plastic container with a cardboard wrapper that you can just slide off), and the branding contains clear instructions on how to recycle. For example, I just took this wrapping out of the trash [1], which says "wrapper: paper" to the left, and "rest: plastic" to the right.

[1] https://i.imgur.com/XMwa2US.jpg