After reading the one review I wasn't sure if flour was to be added or not. I thought these were delicious (although more chipotle's were added and not seeded), and next time I will leave out the 1/2 cup of flour I added. The yogurt probably makes flour unnecessary.
I am going to leave a comment to this recipe instead of the usual review with stars. This recipe is missing a major ingredient-- flour. I added 1/2 cup flour to the mixture, cooked these in a jumbo muffin tin and got 4 well rounded muffins.