Bake the brownies in the prepared pan until just done, 20-25 minutes. Center should be set and a toothpick inserted two inches from the side should come out clean or mostly clean. Be careful not to overcook them.
While the brownies are still warm spread them with the topping.
Melt the chocolate and butter in the microwave. Add the water and sugar and stir until smooth. Spread over the still warm brownies and sprinkle with the chocolate nibs using more if you like it very crunchy.
Cool, cut and devour!