Clean and trim mushrooms
In a large bowl mix seasonings, liquid smoke, and oils tossing mushrooms until completely coated.
Place the coated mushrooms between 2 heavy heated pans, preferably cast iron pans. Pressing firmly to flatten mushrooms and sear both sides evenly
Place flattened mushrooms on baking sheet or baking dish coating both sides with bbq sauce and bake for 45 minutes at 350º