請問法文甜點的creme fraiche epaisse 是什麼?哪裡可以買的到呢？謝謝?

Following link tells you what it is:
http://behind-the-french-menu.blogspot.ca/2012/08/creme-fraiche-that-unique-cream-that-is.html

You can easily make crème fraîche épaisse (same as crème fraîche) using recipes such as:
http://www.epicurious.com/recipes/food/views/creme-fraiche-106036
You need to leave the mixture at 70 degrees (room temp.) for 8 to 24 hours for the bacteria to do their job!

They should be available in supermarkets. Google "creme fraiche image" and you'll see numerous brands.