If you like your muffins light and sweet and soft — in other words, miniature cakes — these will not be the muffins for you. (These are not Barbie muffins.)
If you think a muffin should give you something to sink your teeth into, with more substance than sugar, these might be the muffins for you. (These are real-woman muffins.)
I still consider these a work in progress, but as a proof of concept — the concept being that a lusty muffin can be made with dry sourdough bread crumbs as the sole “flour” — they’re not bad.