In a large mixing bowl, combine the sugar and butter until light and fluffy, 2 minutes.
Add the eggs and vanilla and beat until incorporated.
In a separate medium-sized bowl, combine the cocoa powder, flour, salt and baking powder. Stir until mixed.
Add half of the dry ingredients into the butter-sugar mixture, beat well, then add remaining half.
Fold the mixture into the prepared baking dish and then place the cherry cordials sporadically among the brownies.
Bake for 25-30 minutes, until the center is firm to the touch and the edges are crisp and pull away from the edges of the pan.
Meanwhile, combine the cherry frosting ingredients, adjusting the consistency by adding more milk or powdered sugar, as needed.
Once the brownies are cool, spread the cherry frosting overtop using an offset spatula.
Sprinkle the chopped cherry cordials over the cherry frosting.
In a small microwave-safe bowl, melt the chocolate chips for 35 seconds, stir well, and reheat as needed until completely melted. Stir in the shortening to loosen up the chocolate to make it easier to drizzle.