Madeleines were Proust’s favorites. I must say I love them too, and they are not the easiest to bake.
I found a french brand that sells good madeleines, quite close to the original version, and they are very practical to carry in your handbag or to give to children, as they have individual packaging. They are a bit expensive and quite rich, so I only buy them as occasional treats.
You can find ingredients and possible allergens here.
La Vie Claire are supermarkets selling organic food.
They stock a good range of gluten-free products available, with even a few fresh gluten free products such as pizza and crusts, and some frozen gluten free food as well, such as tatin apple pie or Schär frozen gluten free pizza. I’ll be posting reviews on some of those products.