Fluffy; plump; soft and full — a mimetic adverb describing something soft, rounded, and well puffed up (like bread, cheeks, or cushions).
焼きたてのパンは外はさっくり、中はふっくらしている。
Freshly baked bread is crispy on the outside and fluffy inside.
祖母の頬はふっくらして健康そうだ。
My grandmother's cheeks are plump and look healthy.
おにぎりはふっくら握るのがコツだ。
The trick to rice balls is to shape them so they're nicely plump.