In a large glass bowl, melt the coconut oil in the microwave. If you’re using liquid oil, just pour it into the bowl. Whisk in the salt, vanilla, cocoa powder, and sweetener. Add the purée of choice and mix well to combine. Add the baking soda, coconut flour, and oat flour and whisk until a thick batter forms. If the batter happens to be too dry, just add a couple tablespoons of water at a time until a thick, but not crumble-y, batter forms. Keep in mind that this won’t be like smooth pourable brownie batter, it will be thick, pasty, and almost cookie dough-like.