The sentence that contains an example of verbal irony is:
"On the bakery’s opening day, the baker pulled the pan of cinnamon rolls out of the oven to realize he forgot to add the baking powder and they were all flat. 'One of my biggest hits,' he laughed."
In this case, the baker is referring to his flat cinnamon rolls as "one of my biggest hits," which is ironic because flat rolls are typically not considered a success or a hit in baking.