Separate the oyster clusters into flat pieces and trim off the bulbous ends (you can use kitchen scissors or a chef's knife to do this) and set aside.
Split the lime juice between the 2 large bowls of almond milk and whisk to make buttermilk.
Add the oyster mushrooms to the bowl with 2 cups of buttermilk and leave to soak for 10 minutes.
While the mushrooms are soaking prepare the other ingredients.
Place the tapioca starch in a medium sized bowl and set aside.
Add all of the herbs and spices listed to make the coating to a spice/coffee grinder (you may need to work in batches).
Mix together the spice mix with the brown rice flour in a medium sized bowl.
Set up your workstation/bowls in this order - oyster mushrooms in buttermilk, tapioca starch, dipping liquid, the coating and a resting plate.
Carefully remove one of the oyster mushrooms from the buttermilk bowl (shaking off any excess milk).
Place the mushroom into the bowl with the starch and use a spoon to roll/coat both sides.
Dip the mushroom into the almond milk (again shaking off any excess liquid).
Place the mushroom into the bowl with the coating mix and again use a spoon to apply the coating.
Place the coated oyster mushroom on a plate and repeat the above steps with the remaining mushrooms.
Preheat the air fryer.
Spray cooking oil (I used olive oil) on a liner or the air fryer basket.
Place the coated oyster mushrooms in the air fryer basket (you may need to do this in batches).
Lightly spray the tops with oil.
Air fry @190C/374F for 10-12 minutes turning half way and re-spraying with oil.
Serve immediately.