Last year, Helena Faustin nearly doubled her annual income — all thanks to a side hustle.

In her day job, the 35-year-old is a neonatal intensive care unit (NICU) nurse living in Freeport, New York, making $105,000 per year in salary. In her off hours, she's spent the past four years running That Nurse Can Cook, a food blog where she details recipes and posts cooking videos.