Heat up the butter in a frying pan. Fry finely chopped champignons for 2 minutes, pour cream, salt, pepper, add Provence herbs. Bring to a boil over low heat for another 2 minutes.
We cut the baguette. Grease the lower part with mushroom sauce. Top with ham, cucumber slices. Then blue cheese. Cover with the top of the baguette. Drizzle lightly with olive oil and sprinkle with sesame seeds.