Rudolf the rednosed reindeer discovered that his nose was an apple and started eating it
Usually we would write én to mean "one". Some people might drop the accent, although the Language Council of Norway recommends using it. In the spoken language you would hear the difference, with én typically being stressed, and the indefinite article not being able to carry stress. Here it actually does sound a bit like she's saying "én", and not "en".
In which words do you use en and in which words et? It is a little bit puzzeling.
EN is masculine gender (can use for feminine also) ET is neuter
Open 1st lesson (BASICS) and you will see!