Mix all ingredients except the chocolate chunks and the panko in a medium-sized mixing bowl until fully combined.
Fold in chocolate chunks.
Pour into prepared baking pan and use a spatula to evenly spread the batter.
Bake for 15 minutes.
Remove from the oven and evenly distribute the panko on top of the partially-cooked brownies.
Return to the oven and bake for another fifteen minutes or until a toothpick comes out dry.
Ideally, you should wait for them to cool prior to cutting (they'll cut more cleanly), but then you'd miss the joy of hot brownies. So, I say, make a mess and eat some right away!