Jumbo muffins with pumpkin for added fiber. These are really just chocolate muffins and you can hardly taste the pumpkin. Also, you don't have to make them jumbo.
You can make these as regular size muffins as well. Check them at 18 minutes. You should get about 16 standard size muffins.
If you want an even softer muffin, swap out some of the butter for coconut oil. You could also try leaving out the butter completely and substituting a generous 1/3 cup of vegetable oil.