vs
QUICK ANSWER
"A la" is a phrase which is often translated as "at", and "en" is a preposition which is often translated as "in". Learn more about the difference between "a la" and "en" below.
a la
A phrase is a group of words commonly used together (e.g., once upon a time).
en(
ehn
)A preposition is a word that indicates the relationship between a noun and another word (e.g., He ran through the door.).