Nutrition filled snacks

I’ve lost 15lbs this pregnancy I’m 20w and still not gaining any weight back I’ve actually lost 3 more since last doctors visit. At first it was the morning sickness now it’s more food is unappetizing and too much food (I don’t eat much so maybe half the size normal portion) doctor said to try snacking and shakes so what do y’all recommend to be the best nutrition filled.