Preheat oven to 350 degrees F. Grease an 8×8 baking dish.
Using a handheld mixer, beat together ghee, maple sugar and vanilla extract in a medium bowl for about 1 minute then add eggs and beat for another minute until mixture becomes light in color.
Add in cassava flour, unsweetened cocoa powder, espresso powder, baking powder and salt and mix until completely combine. Then fold in chocolate chunks.
Place batter into the greased baking dish and spread out evenly. Place in oven to bake for 30-35 minutes, until the middle is cooked through and a toothpick comes out clean. Let brownies cool 10 minutes before slicing!