Learn Farsi: قناد یک سینی کاپ‌کیک دارد.

In Farsi, containers or measure words are linked to the item they hold using the ezafe vowel. Since سینی (sini) ends in a vowel, it takes the -ye form, making it سینیِ کاپ‌کیک (sini-ye kap-keyk) to mean 'tray of cupcakes'. This is just like saying یک فنجان چای (yek fenjan-e chay) for 'a cup of tea'.

Since the English translation says 'cupcakes', why isn't the plural suffix ـ‌ها (-ha) used here?

When a noun immediately follows a unit of measurement, quantity, or container like سینی (tray), Farsi keeps the noun in the singular form. Even though we understand the tray contains multiple cupcakes, کاپ‌کیک stays singular.

Would I use the word قناد (qannad) for someone who bakes bread?

No, قناد specifically refers to a pastry chef or confectioner who makes sweets, cakes, and pastries. If you are talking about a traditional bread baker, you would use the word نانوا (nanva).

Why is there a small gap in the middle of the word کاپ‌کیک?

This is a zero-width non-joiner, or 'semi-space'. In Farsi, loanwords or compound words made of two distinct parts (like 'cup' and 'cake') are often typed with this semi-space to keep the components visually separate while still treating them as one single word.