Cut the head off the king oyster mushroom and slice off “gills” from the thick stems of the mushrooms
Put the prepared mushrooms in a large mixing bowl, add the toasted sesame oil and soy sauce, mix well. Add garlic powder, onion powder, smoked paprika, cinnamon, brown sugar, salt, and pepper. Stir so that mushrooms are evenly covered
Heat vegetable oil in a cast iron skillet, on a medium high heat. Add the mushrooms and then put another skillet on top of the mushrooms
Apply light/medium pressure to the top skillet with your hand until edges are lightly charred
Remove the top skillet off the mushrooms and flip mushrooms with a pair of tongs
Put the second skillet on top of the mushrooms again and apply more pressure. The mushrooms need to be seared and lightly charred all over the skin
Add mushrooms to an oven dish, cover them with bbq sauce (you can also add sriracha sauce if you want it to be more spicy!), cover them with tin foil and prick the tin foil a few times
Put the tray in the oven and bake the mushrooms for 50-60 minutes at 350ºF
Pour some of the left over bbq sauce over the mushrooms, garnish with parsley and serve