Character Gaps On Comic Conversation : 6 I am reading a comic book to learn more Chinese. I have some problems with seeing some characters in this older copy of a book (the Chinese character is sometimes too dark to distinguish strokes and scanning doesn't help).Thank you for any help finding the missing characters (I don't need the translations, per se but just seeing a clear copy of the character would be helpful).
There are multiple questions because I want to show the work in context. I could break these up into smaller questions but that would not be helpful to other learners (learning conversation) and would unnecessarily clog the website.
Pane 2 ( ? ➜ missing character )

这是什么？：What is this?
（？）（？）：

Pane 3 ( ? ➜ missing character )

一定很好吃!: (It is) Certainly delicious!
（？）: Not sure about the repeated character on the side but guessing its a sound?

Pane 4 ( ? ➜ missing character )

我（？）一次吃这裡（？）西。：

Pane 5 ( ? ➜ missing character )

谢谢你的（？）（？）: Thank you for...


UPDATE
First to restate, thank you to everyone for helping me learn more Mandarin! I hope that asking about unrecognized characters is okay on this site. I am adding the new characters and meanings to my phrase book.
Below are the accepted answers:
Pane 2：
麻薯：potato? ok, I saw a picture and it looks like roasted rice cakes (aka Mochi or yakimochi)

(Turns out this was not so simple. The meaning is a reference to yakimochi - i.e. roasted rice cake. Which is funny in this context. It's a hidden joke by the author ! )

Pane 3:
咔咔：you are right, is a sound like kaka
Pane 4:
我头一次吃这种东西：It is my very first time eat something like this.
Pane 5:
谢谢你的招待：Thanks for your hospitality.
partial answer： pane ３：咔 [kā]，pane ４ 我頭（头）一次吃这種（种）東(东)西 pane ５： 谢谢你的招待