Heat 1 tablespoon oil in a huge saute skillet over medium intensity. Add spinach and cook, throwing incidentally, until withered and beginning to look dry, around 5 minutes. Move spinach to paper towels, and crush out overabundance fluid.
Place spinach and mayonnaise in a food processor, and mix until exceptionally smooth. Go through a fine strainer, and dispose of solids. In a perfect food processor bowl, beat spinach combination, mustard, yolks, and staying 1 tablespoon oil. Add salt and pepper, and heartbeat to join.
Move blend to an enormous channeling pack fitted with a 1/2-inch star tip, and line filling into each egg-white half. On the other hand, spoon filling into whites. Decorate each with a little branch of chervil or thyme, and serve right away.