In a large bowl, prepare mix according to package.
Whisk in an extra egg.
Heat waffle iron to medium heat.
Spray with nonstick spray and spoon 2 TBS of batter into center of iron.
Cook for 2 minutes until waffle is just set.
Turn iron off and allow brownie to cool with the waffle iron open for 5 minutes.
Carefully remove the waffle from the iron and serve immediately.