Lightly grease a 8" baking pan. Or cut 2 strips of parchment paper the width of the baking pan and place them into the pan crosswise if you want to be able to lift the brownies out of the pan.
Add all of the ingredients listed into a medium sized mixing bowl. Mix until completely combined, then spread it evenly into the prepared baking dish.
Bake until puffed in the center and just done but still fudgy, about 20-25 minutes.
Let the brownies cool completely on a wire rack before attempting to carefully lift them out. Otherwise let cool as long as you'd like before slicing and diving right in!
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Notes
Raw cashew butter makes for the best crackly top and best chocolate flavor too. But I've also used roasted cashew butter and almond butter, and both are great. Just be sure the nut butter you choose doesn't have anything added, (like salt, sugar, oils, etc.).