Combine cracker crumbs,flour,sugar,baking powder,and coconut. Add melted butter and milk. Reserve 1+ cup for topping. Pack remainder in bottom of greased 9"x14" cake pan. Bake for 10 minutes at 350F. Cool for 20 minutes.

Combine the sugar and cornstarch in a saucepan and add in the rest of the filling ingredients. Cook over low heat to the boiling point,stirring constantly. When thickened remove from heat and cool.

Spread cooled filling over cooked base. Sprinkle top with remaining topping. Bake 30 to 35 minutes at 350F. Cool. Cut into squares.(the squares can be small or large, depending on how you wish to serve them.)