The first boss was monotonous and took an extremely long time to beat, since both of us were bullet sponges, then I quickly lost to the second boss because I made my deck more offensive. Also, it's "make a toasty mushroom", not "make toasty". What an annoying butchery of the English language.
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https://dictionary.cambridge.org/dictionary/english/toasty#google_vignette
Toasty IS an adjective, meaning: "Comfortably and pleasantly warm". You could say "toast mushroom", and that would indeed be correct. But by that process, the mushroom is literally made toasty. So to say "make toasty", in reference to the mushroom, is absolutely valid.