"Brownie bits" refers to small pieces or crumbs of brownies. It can either be the remains of a whole brownie that has been cut or broken into smaller pieces, or it can refer to small bite-sized brownies. Full definition
We'll also show you to make to make chocolate brownie bites that include espresso powder for a zest of flavor. (health.com)
Here are some recipes I've tried and liked: salted peanut butter cookies, raw brownie bites, and the aforementioned tahini cups with coffee cream filling. (thetinatimes.com)
I made these into brownie bites for lower caloric value. (isachandra.com)