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Translation

• Context: Momo can't cook like a normal person. She's impressed by Shamiko's normal cooking skills.
• ...sou da ne, Shamiko futsuu ni Win'naa itameteta mon ne
  ･･･そうだねシャミ子普通にウィンナー炒めてたもんね
  That's right, Shimiko can fry wieners normally.
• ryouri wa dekiru-n-da ne
  料理はできるもんだね
  Cooking (wa), [you] can do, huh.
• "wa" tte nan-desu ka!!
  「は」ってなんですか！！
  What do you mean by "wa"??!!
• Implicature: Shamiko's not-cooking is not-doable. She's usually a klutz who can't do anything right.