ut the purxe9ed beans, whole wheat flour, cocoa powder, baking powder, baking soda, brown sugar and chai masala in a large and deep bowl. Beat this together, using a hand held mixer, till well blended while scraping down the sides of the bowl a couple of times.
Add the purxe9ed apple (or applesauce), yogurt and vanilla extract and beat again, on medium speed till the batter is well mixed and smooth. Fold in the walnuts and half the chocolate chips.
Scrape the batter out into a greased and parchment paper lined 8" by 8" square cake tin. I used a 7" by 7" tin but an 8" by 8" tin would be better as the brownies would be thinner and cook better.
Smoothen the top and sprinkle the remaining half of chocolate chips on top. Bake at 190C (375F) for 20 to 30 minutes till done. Allow to cool completely, at room temperature before unmoulding and cutting into squares, or the brownies will be "squishy".
Serve as they are, with custard sauce, or low fat, eggless ice-cream or ice-cream of your choice. If not serving immediately, place in a lidded box and refrigerate. I found these brownies tasted better the next day.