Press a basic butter shortbread dough into a pan and bake until lightly set. Spread a layer of orange marmalade over the hot crust.
In a bowl, mix eggs with brown sugar, then stir in flour, baking powder, salt, shredded coconut and chocolate chips to make a batter. Spread this coconut-chocolate mixture over the marmalade layer. Bake until the topping is set and golden. Cool and cut into squares.