Heat your oven to 350℉. Lightly grease a 8x8 pan. If you want to be able to easily lift all the brownies from the pan at once, cut a length of parchment paper that will hang over the edges of the pan by 2" on each side.
In a small bowl, mix the ground flaxseeds and water together. Set aside and let sit for about 5 minutes.
2 TBS flaxseed meal, ⅓ cup water
Wash the sweet potatoes and then prick each with a fork. Put them in the microwave and cook on high for 5 minutes. They are ready when they can easily be pierced with a knife. When cooked, scoop out the needed amount of sweet potato from the skins.
In the bowl of a food processor, process the cooked sweet potato, peanut butter, melted coconut oil, hydrated ground flaxseeds, vanilla, and maple syrup until smooth.
1 cup sweet potato puree, ½ cup natural peanut butter, ¼ cup melted coconut oil, 2 tsp vanilla, ¼ cup maple syrup
Transfer everything from the food processor to a large bowl. Add the cocoa powder, salt, and baking soda and stir to combine.
¼ cup + 2 TBS unsweetened cocoa powder, ½ tsp kosher salt, ½ tsp baking soda
Reserve 2 tablespoons of the chocolate chips to sprinkle on top, and then add the rest of the chocolate chips to the batter. Mix to incorporate them throughout the batter.
½ cup semisweet chocolate chips
Pour the batter into the prepared pan, using a rubber spatula to smooth it out evenly throughout the pan (the batter will be thick). Sprinkle the reserved 2 tablespoons of chocolate chips over the top.
Bake in the oven for 45 - 50 minutes.
Let the brownies cool in the pan for 30 minutes, then lift out using the parchment sling. Place on a cooling rack until completely cool to the touch. Slice into 24 brownie squares and enjoy!