Sweet Potato Brownies. Preheat oven to 350°F and line an 8×8” baking dish with parchment. Cook sweet potatoes until soft, cool and puree. In a bowl, mix sweet potato puree, ½ cup peanut butter, ⅓ cup maple syrup, 2 eggs, and 1 tsp vanilla until smooth. In another bowl, combine ⅔ cup whole wheat flour, ½ cup cocoa powder, 1 tsp baking powder, and ¼ tsp salt. Stir dry ingredients into wet, then fold in ⅔ cup chocolate chips. Spread batter in dish and bake 20-25 minutes until set.