Cupcake cases (or baking cups) are one of those things that should be readily available plastic-free. But unfortunately, sourcing plastic-free packaged cupcake cases is very tricky! Not only this, the cases themselves aren't normally compostable due to being mixed materials or being coated to help them be non-stick.
These cases by 'If You Care' are packaged in an unbleached, fully plastic-free box and the cases themselves are home compostable.
Available in Large (50mm wide by 35mm tall) and Mini (35mm tall by 19mm wide), next time you're needing cases for your cakes, choose the more sustainable option and go plastic-free!