Heat olive oil in a medium skillet and add in all sliced mushrooms. Cook mushrooms browned and excess fluid has evaporated (approx. 10 minutes on medium heat). Add salt to taste.
Get sauce (not the actual chipotles) out of the canned chipotles in adobo and add it to the pan. Add in the sour cream and lemon juice and stir. Cook down for 5 minutes
Serve sauteed mushrooms on top of warm tortillas with crumbled queso fresco and mesclun greens topped in olive oil, salt and pepper