Hpk Greaseproof Paper Cake Cups Muffin Cupcake Liners, 100-Pieces, Multicolour Easy to use, just place them on any baking tray, fill with your favorite cupcake or muffin batter, and into the oven. Save time,put these versatile cups straight into the fridge or the freezer- and pop them into the microwave anytime for fresh, hot muffins or delicious cupcakes.