It is possible I will get my French followers angry as I did modify their beloved (and delicious, but not keto) recipe.
Pardonnez-moi mes amis mais je devais changer la recette
I did not change it much, I just did skip the flour (and honestly for me I prefer it this way), and to reduce the carb content, I also skipped the shallots.
All I can say that even my son, not a fan of mussels, loved it.
Just try it, it is soooo good
Dig in and be happy