What part of speech is brownies?

A brownie is a delicious chocolate mix, usually made from flour, eggs, sugar, cocoa/chocolate and butter. It can be served at fancy dinner parties or for quick lunches! Best treat ever.

Brownies are awesome brown squares made of chocolate and flour, eggs, sugar, etc. eat one at a party or for a quick snack, or even 4 for lunch! enjoy them while they last!! ( try to get the last one, its usually the best!)