Can you please explain this sentence:

One thing that I'd really miss is my mom's cooking.

As a noun phrases containing relative clauses

I'm not quite sure what you want but this is how I see the sentence:

One thing that I'd really miss is my mom's cooking.

One thing is my mom's cooking. (main clause)
that I'd really miss (restrictive/defining relative clause)

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one thing I'd really miss is a noun phrase. It is made up of a noun (one thing) and a relative clause (i'd really miss). The noun phrase can go before or after be. Here it is before the verb be. It is the subject.
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