[He nods in agreement, his mouth too stuffed with delicious cookies to actually say anything. Once he swallows, though, he thinks about her question.
Bonnie's right: Bart doesn't know her very well, beyond her age, her general location, and... that's kind of about it. Huh.]
Uh... [He takes a sip of his hot chocolate, as if that'd magically make him come up with a question.] Oh! I know. You're from Earth, but is your Earth the kind with superheroes, the kind that plays video games with aliens, or the kind with supernatural stuff like vampires?