Trim the stems from the mushrooms and wipe the caps clean. Brush both sides with 1 tablespoon oil and sprinkle with dry seasonings evenly. Set aside.
Combine slaw ingredients and set aside.
Heat a skillet over medium-high heat and add remaining oil. Once hot, add mushrooms. Cover and cook for about 4 minutes on each side until soft and blackened. Sprinkle with soy sauce. Turn off heat.
Warm tortillas and slice avocado. Cut mushrooms into about 6 slices each. Serve in tortillas with avocado, slaw and warm chipotle salsa.