At least Flan will eat her cookies.

So I shall take this cookie, and eat it?

Shouldn't it be "Uu" instead of "ugh". Cause it seems just wierd to utter displeasure and yet enjoy it.

Actually, my reading is the childish single-sound affirmation derived from「うん.」and having one's mouth full. I don't see any visual indication that Flan dislikes the cookies so I think this is reasonable.

Chef Remi is the awesomest thing on this page, and that says a lot.

Adding fourth wall tag, as Flan's surprise shatters the bounds of reality.