Preheat oven to 375 degrees.
Separate the egg whites from the yolks and beat with the cream of tartar until soft peaks have formed.
Meanwhile, in a food processor, combine the almond flour, egg yolks, baking powder, melted butter, salt and herbs, if desired.
Add 1/3 of the egg whites to the processor.
I like to mix the remaining 2/3 egg whites by hand so as not to deflate them too much, but you can incorporate briefly in the processor.
Pour into a prepare loaf pan and bake for 30 minutes or until a toothpick inserted comes clean. It should be golden brown.
Let cool for a few minutes before removing to a rack to cool completely. Or enjoy warm with some butter.