Yes, and taller mugs may be better to keep the cake from bubbling up over the side! I used a small but wider 14-ounce mug so the mixture would look nice in photos. It’s hard to take photos in a big mug because of the shadows. However,  I tested this recipe in a big mug (and I also tested it in a ramekin a few times), and it works just fine! Gives you more room for vegan ice cream anyway. :D