N2O said: You can only get better with repetition... But I think Teto will need a thousand more tries before she can get her cookies right...
Suzu survives. Maybe she developed an immunity from poison cookies years ago?
I think the cookies went to another dimension,like all her food, and so the deadly cookies probably would have no effect. Also, who knows. Maybe after a few more years(100 more 4koma strip meaning) Teto maybe able to make cookie normal burnt cookies.