Preheat oven to 350. Clean and remove stems from the mushrooms and lay flat on a baking sheet. Slice goat cheese and put disc in the center of each mushroom. Drizzle with olive oil, salt, pepper and red pepper flakes. Bake for about 20 min or until cheese is nicely melted
Combine all ingredients for your vinaigrette and whisk until smooth.
Coat bread in olive oil and cook in a skillet for 2-3 min per side.
Assemble your sandwich: add vinaigrette, greens and mushroom to bread. Top with pickled shallots and more vinaigrette. Enjoy!