"My cookies are tasty."
Translation:Moje ciasteczka są smaczne.
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My personal view is that "to" is a bit like an "=" sign. It can only be used when you have nouns/noun phrases on both sides. As here you only have an adjective 'on the right-hand side', you can't use "to".
If the sentence was "My cookies are tasty cookies", silly as it is, that could be "Moje ciasteczka to smaczne ciasteczka". Or "Moje ciasteczka są smacznymi ciasteczkami", with the second noun phrase in Instrumental.
Just in case, more info here: https://forum.duolingo.com/comment/16373167