Perfect muffins BUT and it's a big BUT, the other review is right. The cook time is WAY off. Follow the 425 to 400 instructions. Those seem to work. Cook them for 25 min and check. They were perfect for me at 25 minutes. If you let them go as long as the recipe says, they will absolutely be burnt.
The taste is fine. The cooking instructions are way off. They came out burnt & charred on the top, and I checked them at 30 min. I may try again.