I'm 5'4" 140 lbs. How can I get fat?

I'm a 5'4" 140 lb woman. I've had people say I'm too skinny. I've gone vegetarian and haven't gained a single pound. I'm trying to get chubby. I want to gain some weight, but I don't want to focus on muscle. I don't want to go to the gym. So what are some easy foods to eat that I can gain weight fast on?