Any sized glass will due, just make sure it's microwavable. Fill one third of the glass with cinnamon schnapps, one third with sour apple liqueur, and the rest with apple cider. Stir, and then pop it in the microwave for ten to twenty seconds to warm it up (or mix all ingreditents in a small sauce pan first, heating it slowly while mixing). Makes for a good winter drink to warm you up.