お母さんだけがこのお菓子をつくれます。

mother

only; just; merely; simply; no more than; nothing but; alone; as (e.g. as soon as, as much as); worth

indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and

this (something or someone close to the speaker (including the speaker), or ideas expressed by the speaker)

confections; sweets; candy

indicates direct object of action; indicates subject of causative expression; indicates an area traversed; indicates time (period) over which action takes place; indicates point of departure or separation of action; indicates object of desire, like, hate, etc.