Brioche is most definitely French in origin; however, the process of making it is extremely long & painstaking. Unless u have a lot of experience with pastry work, I would definitely recommend not trying to make it.
If you're looking at taking it in for a class, I would recommend making Vichyssoise. (Vee-she-swa)
1 pound potatoes (about three large), peeled & cubed
6 cups chicken broth (although, u can use water if the broth is unavailable)
4 medium leeks, trimmed
2/3 cup creme fraiche or sour cream
salt & freshly ground black pepper
1) Put the potatoes & broth in a saucepan & bring to a boil. Reduce the heat & simmer for 15 - 20 minutes.
2) Make a slit along the length of each leek & rinse well under cold, running water. Slice thinly.
3) When the potatoes r barely tender, stir in the leeks. Season with salt & pepper & simmer for 10 - 15 minutes until the vegetables r soft, stirring occasionally. If the soup appears too thick, thin it down with a little more broth or water.
4) Puree the soup in a blender or food processor, in batches if necessary. If u would prefer a very smooth soup, pass it through a food mill or press through a coarse sieve/strainer. Stir in most of the cream, cool & then chill.
Vichyssoise is typically served cold & garnished with a swirl of cream & chopped chives.
For more information about Vichyssoise, check out: http://en.wikipedia.org/wiki/Vichyssoise
If ur instructor says that Vichyssoise is not an authentic French dish, he/she is only partly correct. The French have been making potato & leek soup for a VERY long time. It was brought into its current incarnation (served cold) by the French chef Louis Diat while he was working at the Ritz-Carlton in the early 1900's. As he stated during an interview for the New Yorker magazine in 1950, ''In the summer of 1917, when I had been at the Ritz seven years, I reflected upon the potato-and-leek soup of my childhood, which my mother & grandmother used to make. I recalled how, during the summer, my older brother & I used to cool it off by pouring in cold milk, & how delicious it was. I resolved to make something of the sort for the patrons of the Ritz.''