I have found using my new muffin tin creates a diferent shape cupcake. My husband and I reckon the peak in the centre of the cupcake is caused by the metal tin reflecting heat focusing it in on the centre of the cupcake. I usually use silicone trays for my cupcakes. This recipe is from Vegan cupcakes takeover the world by Isa Chandra Moskowitz and Terry Hope. It can be frosted but I decided that would not be appropriate for these cakes as they were destined for a sick mother in law in hospital. I love the melt in your mouth texture of these cupcakes