3. In a small bowl whisk the eggs for 1 minute until bubbly on top. Stir the eggs into the chocolate mix. Add the flour, cocoa powder, and baking powder. Stir until just combined. Stir in the remaining 1/2 cup chocolate chips. Spread the mixture into the prepared baking pan. Bake for 28-30 minutes or until the brownies are just set. Let cool.
4. Meanwhile, make the icing. Add the butter, 2 cups powdered sugar, cocoa powder, vanilla, and 1/4 cup warm milk to the bowl of a stand mixer. Beat until smooth, adding additional warm milk until the frosting becomes thicker, but still drizzly. Taste, adding more sugar if needed. Spread the icing over the bars. Let set 10 minutes, then decorate with sprinkles, if desired. Let set another hour or until dry. Slice, snack, and enjoy!
