Prepare the Marinade: Add the full-fat Greek yogurt to a mixing bowl. Stir in the lemon juice, curry powder, smoked paprika, chilli powder, ground turmeric, salt, and black pepper until the mixture is thoroughly combined. Prepare the Mushrooms: Cut the mushrooms according to their size. Halve medium-sized mushrooms, leave small mushrooms whole, and cut larger mushrooms into chunky pieces or quarters.
Coat the Mushrooms: Add the prepared mushrooms to the spiced yogurt mixture. Stir carefully until all of the mushrooms are thoroughly coated.
Marinate the Mushrooms: Leave the coated mushrooms to marinate for about 20 minutes if time allows.
Preheat the Oven: While the mushrooms are marinating, preheat the oven to 190°C (Gas Mark 5 / 375°F). Lightly oil a baking tray.
Arrange the Mushrooms: Thread the mushrooms onto metal skewers if desired. Alternatively, arrange them directly on the prepared baking tray. Both methods produce the same cooked result.
Bake the Mushroom Tikka: Bake for about 25 minutes, stirring the mushrooms once during cooking if they are arranged directly on the tray.Cook until the mushrooms are soft and juicy and the spiced yogurt marinade is browned with slightly crispy edges. Serve: Remove the mushroom tikka from the oven and serve topped with chopped fresh coriander (cilantro), if desired.