Add walnuts to food processor and pulse until nuts are very small, about the size of large crumbs. Add dates and 4 tbsp cocoa powder. Pulse until dates turn into a thick paste. The mixture should be sticky and it should hold together. Taste and adjust as needed. If you want a stronger chocolate flavor, add 1 more tbsp cocoa powder. If you want something sweeter, you can add more dates. If you feel that the mixture is not sticky enough or too dry, add 1-2 tbsp of water and pulse again.
Line the bottom of an 8 x 4 inch loaf pan with parchment paper. Firmly press brownie mixture into the pan. Place brownies into the fridge to set (about 1 hour).
If making frosting, combine oil and cocoa powder in a medium bowl. Mix until smooth and completely combined. Your mixture should look like melted chocolate. Add in maple syrup. (Do not add maple syrup until the end. The maple syrup will cause the chocolate to seize and will thicken the mixture. If you add it with the other ingredients, it will make it very difficult to mix.) Stir until evenly mixed. Spread frosting over surface of brownies after they are set
If you want the frosting to be firmer, place brownies back into fridge for 15-30 minutes or until frosting is more set. Slice brownies and serve. Store uneaten brownies in the fridge.
Notes
Medjool dates can be substituted with other dates. Please see the post for more details.
I recommend using a new package of dates or a recently opened pack, otherwise your dates may be a little dry.
Walnuts can be substituted with other nuts. Please see post for more details.
You can grind the nuts to the size you prefer. If you want bigger pieces, you can pulse them less. If you want barely visible pieces, pulse more.
Please note that for the brownies in the photos, the frosting has not been refrigerated. I added my frosting on after removing the brownies from the fridge. For a firmer ganache-like frosting that is less messy, frost the brownies and then refrigerate them for 15-30 minutes until the frosting becomes firmer.
I include other simple frosting ideas in the post.
The nutrition information provided are only estimates based on an online nutritional calculator. This is not a comprehensive list of all the nutrients in the recipe (i.e., does not include vitamins, cholesterol, etc). I am not a certified nutritionist. Please consult a nutritionist or doctor for accurate information and any dietary restrictions and concerns you may have.