be in (one's) element

To be doing something that one is very comfortable with or proficient in. My mother is in her element in the kitchen and can make just about any dish.

Common Names:

Name	Pronounced	Usage
Sibyl	SIB-əl	English
Babur	-	Urdu
Alfredo	ahl-FRE-do (Italian), ahl-FRE-dho (Spanish)	Italian, Spanish, Portuguese
Gulla	-	Ancient Scandinavian
Eris	-	Greek Mythology
Ezhil	-	Tamil