According to O. Corriher, the way to get a perfectly puffed up dome on your muffins is to increase your oven heat. She says that 400° should do it, no matter what the recipe says.
The higher baking temperature means that the the outside edges of the muffin will set while the middle is still liquidy. The center continues to rise as the muffin bakes inward, and voila! We get muffins with impressive domed tops.
We aim to try this next time we make muffins for breakfast!
Have any other tips for excellent muffins?