Crush gram crackers using food processor or blender. In a large bowl combine together flour, baking powder, salt, brown sugar and crackers. Add butter to the mixture and mix until you get a soft crumbly mixture.
Spread the dough evenly in a thin layer on a lined baking sheet (size 11X16), pressing down with your hands. Bake for 10 minutes at 350 °F.
Combine coconut flakes with chocolate chips and walnuts. Drizzle condensed milk over the mixture and stir to combine.
Spread the mixture evenly over the crust. Bake for another 20 minutes at 350 °F.
Remove the baked goodness from the oven and let it cool to a room temperature. Cut into sizes of your choice and serve.