Learn Farsi: این قناد است که پودر وانیل می‌پاشد. - It is the baker who sprinkles vanilla powder.

In Farsi, cleft sentences (sentences that emphasize a specific part, like 'It is X who...') commonly use این (this) or آن (that) as the introductory pronoun. Farsi doesn't use a dummy 'it' as a subject like English does in these structures.

Since the sentence refers to a person ('the baker who...'), why do we use که instead of کی?

که is the universal relative pronoun in Farsi, used to link clauses for both people ('who') and things ('which' or 'that'). You might be tempted to use کی, but that is strictly an interrogative word ('who?') and is never used to introduce a relative clause.

Is قناد the general word for any kind of baker?

Not exactly. قناد specifically refers to a pastry chef or someone who makes sweets and cakes (a confectioner). For a traditional bread baker, Farsi uses a completely different word: نانوا.

What is the infinitive of the verb می‌پاشد and how is it constructed here?

The infinitive is پاشیدن (to sprinkle, scatter, or spray). Its present stem is پاش, so for the present continuous tense we combine the prefix می‌, the stem پاش, and the third-person singular ending ـد to get می‌پاشد.