Preheat your oven to 350°F (175°C).

In a large bowl, combine flour, sugar, cocoa powder, baking powder, and salt.

Stir in the milk and melted butter until smooth.

Fold in the chocolate chips gently.

Pour the batter into a greased 9x13-inch baking dish.

In a separate bowl, mix sugar and cocoa powder together, then sprinkle over the batter evenly.

Pour hot water over the entire dish without stirring.

Bake for 30-35 minutes or until the edges are set.

Let cool for a few minutes and serve warm.