This recipe was tested using Diamond Crystal coarse kosher salt. If you use Morton's kosher salt or fine salt, decrease by half for volume, or use the same amount by weight.
I have tested this with all Dutch-processed cocoa and also with half black cocoa. Black cocoa is a type of cocoa powder that has been heavily "dutched", which is a process that alkalizes it to neutralize its natural acidity. This resulting cocoa is very dark in color, almost black, and has a more intense and almost smoky bitter flavor. It is used in cookies, like Oreos, to get a deep, rich chocolate flavor and color. If you can get it, go ahead and try it in this recipe, it won’t disappoint.
Find it online: https://everydaypie.com/almond-flour-brownies/