Back in France, we did not use cranberries simply because they did not exist there. They were one of the delicious discoveries I made when I moved to North America. The tartness of the cranberries is nicely balanced with the buttery caramel created by the butter and sugar. The pecans add crunchiness to this finger-licking good cake. I like to use oat flour to cut down on my gluten intake, but you can also use all-purpose flour.