These tasty cassava flour, gluten-free, chocolate muffins are good, but need more work

Normally I mix up a concoction of almond, coconut, tapioca, and/or arrowroot/cassava flours for gluten-free baking but it’s kind of annoying, and almond flour is sooo 2019. I tried only cassava flour for this small-batch test of 6 smallish muffins. Pretty good result. Feels a little dryer than I’d prefer, and could be a little sweeter. I forgot to set a timer. I’ll try more sugar, another egg yolk, maybe more butter, and I’ll remember to set the timer.